Searching for 'C#' in indexed table

I'm trying to find a way to do a search for c++ or c# on an indexed
table that contains ~ 70'000 word documents.

The server runs Windows NT 4 sp6a and SQL Server 7 sp4.

I've removed the letter c from the noise file but I get the same result
when I do a search for either c++ or c#.

Are the signs + and # considered as operators also when they are
declared as being part of a string ?

I've also tried to declare a variable and assign the string to it but it
still comes up with the same amount of records. Then, to make sure that
the result was wrong, I tried to do a search for 'c+-' and 'c+#' : same
result.

Could it be that you just can't run a search for that ?