Best way to input Apple Maps destination by voice?

Question

I just got Siri Eyes Free integration added to my car, so I am switching from Waze and Google Maps to Apple Maps so I can enter desitinations by voice by simply hitting  button in the steeting wheel.  However, so far I am very disappointed with Apple Maps.
Using the Apple Maps to enter an address by voice has been very frustrating and unreliable.
I have had Apple Maps send me to the wrong desitnation twice in the last week. I think I have figured out "why," but the "reason" is still not really an excuse that justifies the problem.
I asked Siri for "Directions to Walmart in (city name)."  Siri responds with something like "I found a Walmart near (city name) on Green Street.  Is that the one you want?"  The Walmart was indeeed on that street, so I said. "Yes."
Siri then said something roughly equivalent to "Routing to 123 Main Street."
That makes no sense, It just said it found Walmart on Green Street.  It proceded to give directions to a desitination on the other side of town on "Main Street.".
Today I asked for directions to a Comcast office and had the same expirience of it routing to a different address then the location of the business I asked for.. 
I figured out that both times Apple Maps was routing me to the town center  of each town instead of the specific place I originally asked for.
To "work around" this issue I found that I could rephrase the request in a more convulted way and it would get me to the correct directions.
I tried asking Siri to "Find Walmart in (city name)" and then Siri found it asked if I want to call it or get directions.  I said "Get directions" and then Apple Maps actually routed to the correct destination instead of the city center.
This needs to be fixed. It is clearly a bug.  The first time it happened I didn't notice it had said a different street name in the second response than it said when it asked "is that the one you want?" so I ended up driving several miles out of the way.  The workaround I found to bypass the issue is alot of unecessary work especially if you have to pick from a list of several possible locatons.
Is there a more relaible and short way to make Apple Maps give correct directions to a place of business when it is entered via voice command?
The second problem I had was when I submitted a residentual street address by voice.  This is is even more frustrating because it keeps trying to route to addresses in cities hundreds of miles a way.
I will ask for directions to a street address in a neighboring town and Apple Maps will say it is going to route to an address with similar street name in a city that is no where near where I am instead of the street that is in the neighboring city.  Sometimes it will get it after repeating the command a second or a third or a fouth time.
Sometimes it will work if I say the zip code instead of the city name and sometimes that doesn't work and it will say it can't find that street name in the city that belongs to that zip code, but the exact same command will work once I am within the city limits of that city.  This also needs to improve.
Is there a specific way or format of entering street addresses and limiting it to the closest cities that contain streets with that name (or similar sounding street names) so that it does't try to route to a similar street name far away when there is also the same street name 5 or 10 miles from my current location?

Answer 1

It would be nice if I could find something that
would
allow me create utf-8 Vietnamese characters directly
from my keyboard
Go to system preferences/international/input menu. Check the box for Vietnamese, plus the box for "show input menu in Finder." Plus the box for Keyboard Viewer. Then select the Vietnamese item in the "flag" menu at the top right of the Finder. Open TextEdit or other Unicode app (not AppleWorks or WordX) and type.
Please let me know if some part of this does not work for you.
PS To see which key does what, select Keyboard Viewer in the "flag" menu.
PSS In case you are talking about inputting Vietnamese into web forums, you will need to use FireFox instead of Safari. Some such forums are (stupidly) run in Latin-1 instead of UTF-8, which means all input has to be in the form of html escape codes (numerical character references). FireFox does this but Safari does not.