HT5569 unable to join in wifi on iphone 5 iOS 7

I have iphone5. It was updated to iOS 7
But I have a big problem that my phone doesn't connect to some wifi
When I use the wifi at home, it's OK
but when I am in school or another place, it can't connect to wifi at that place
>"<
I tried resetting the Network, but it was useless 
It says " Unable to join ....... "
Would you show me the other way to solve this problem ?
I'm Vietnamese, and I very bad at English.
I think there are some mistakes about grammar in this discussion.
I am so sorry about that.
I always expect your answers !
Thank you for reading

If it will not connect to a specific network, try going to Settings and then forget that network.  Reboot the iPhone by holding both the power and home buttons until the apple logo appears and it restarts, ignore the red slider if that appears.
Then go back to Settings and WiFi and try to choose the network again.
See if that helps.
Grammar is fine, very easy ot understand.

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