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Ok so I have a search list to look for something like "a n other" (a name actually), it is searching on header download.
But it is downloading anything with other in it, like otherwise, etc, instead of looking for a n other or a.n. other etc.

How do I fix this?

If you're using headers, you can use a regular expression to search with more details.

For example if you're searching for "biggus dickus" you could use

"biggus[.\s-]dickus"

Which would match on
"biggus dickus"
"biggus dickus"
"biggus-dickus"

I haven't tested this exact RE but and RE like that should work.