Lucene.net

Question

I've tried using Lucene in my code, but I've some problems.

I need to find the input string complementary, as it's written in the source files, but the lucene indexes by words,
for example :
There's a file includes:"a b c"
the input string is: "c b a"
The basic analyzer returns true for this input ' and I want to implement the analyzer for return false.

Does someone know about it, or in general about using Lucene?

Thanks a lot!!!