In addition to Davin answer, you can also search for Confluence pages having an specific word by running a select query in the BODYCONTENT table like the example below:
select c.title from content c join bodycontent b on b.contentid = c.contentid where b.body like '%<word_to_search>%';
Just replace the <word_to_search> from the query above and run.
I you want to search for a specific phrase then surround it by quotes in the search field. Also, check our the Search syntax page. It has some good info for how to effectively search Confluence.
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