The 'search' ability on this forum can be really bad.  Also, the search engine only updates things every now and then (for example, every hour), so brand-new posts often don't show up on a search.

For the most part, using Google for a search works much better.  If you want to to specifically search on this site, you can enter "site:https://accountants-community.intuit.com" then your search words.  But again, it can take a period of time before Google has registered it, so brand-new posts may not show up.