As with most forum and general website search functions, the search function here is not that great.
If I need to search the forum, I use Google as it indexes this forum in near real time and offers more flexibility when looking for one or more keywords and for also excluding terms from your search.
In the google search box, the basic syntax is:
keyword(s) site:web address of site
For example:
bob site:forums.equipped.org
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
John Lubbock