SQL Server Containstable issue

Hi experts,
I replaced my contains statements in our FT Search with containstable statements.
Containstable seems to run much faster in our case.
My problem is that searching for "word1" return a specific ID.
Searching for "word2" retuns the same ID.
Searching for "word1" and "word2" dont find that ID.

Due to our programm functionality this is very important for us.
Any ideas?

select * from containstable(tblName, (txt,syn),  '"DARM*"' ) as FT_TBL
order by  FT_TBL.[Key]
Result:
Key                                    Rank
...
8455683147005	10
 
 
select * from containstable(tblName, (txt,syn),  '"MG=10ST*"' ) as FT_TBL
order by  FT_TBL.[Key]
Result
...
8455683147005	64
 
select * from containstable(tblName, (txt,syn),  '"DARM*" AND "MG=10ST*"' ) as FT_TBL
order by  FT_TBL.[Key]
 
No results!!!

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