Thanks for you reply!!
And sorry for late answer. I did not get notice about your answer.
It could be any word in [ code ] tags х. Some function's name.
Of course we did not search such word as "if" or "else".
Why it is normal ??? Is there any way to fix it (except writing extension)??
Could it be the problem of broken search indexes ???
And if i will try make re-indexing - will it help me ? (i know it is very long process, that's why i'm asking you)