Best Search function to use is the one on the Top Right of every screen.
There you can choose to search the particular topic, thread, subforum or entire forum.
Best way to use it is to search for an exact phrase (same as Google).
Example:
Searching for Albright Knot will bring up all threads that have the words 'Albright' and all threads which have the word 'knot' in it.
If you put inverted comma's, as in "Albright knot" - then the search function will search only for that exact phrase.
If you want to search for the fig 8 knot, then type in: "Fig 8" INCLUDE THE INVERTED COMMA'S TO NARROW THE SEARCH