Fulltext-search using contains doesn't deliver the exspected result

Question

Hello,
under SQL-Server 2012 I have a table like
create table test
  id integer not null,
  data varbinary(max) not null,
  constraint pk_test primary key (id)
and a fulltextindex on it like
create fulltext catalog fttest;
create fulltext index on test key index pk_test on fttest;
alter fulltext index on test add (data TYPE COLUMN fileext language 0x0407);
data contains a rtf with the word kettensäge1044 in it.
I search in the field using:
select * from test where contains(data, '...')
Instead of the points I use
"kett*", "kette*", "ketten'", "kettens*", "kettensä*", "kettensäg*", "kettensäge1*", "kettensäge10*", "kettensäge104*", "kettensäge1044*"  -> record
is found
"kettensäge*" -> record is NOT found.
Same as "schafwollenteppichknüpfer"
-> Search is working for "schaf*" till "schafwoll*", "schafwollent*", "schafwollentep*" til "schafwollenteppichknüpfer*"
-> Search is not working for "schafwolle*", "schafwollen*", "schafwollente*"
I don't understand this. Why behave the search different and why are some words are found and some not?
Greetings
Stefan Westner

Answer 1

Please check the links below that might helpful to you to understand full text search in SQL Server
http://www.developer.com/db/article.php/3446891/Understanding-SQL-Server-Full-Text-Indexing.htm
http://sqlmag.com/sql-server/sample-full-text-search-engine
http://msdn.microsoft.com/en-IN/library/ms142571.aspx