It seems like some of you are having issues with the search. This is how it works:
If you search via that search box in the top right from the board index, it will search the whole forum.
If you search via that search box in the top right while in a subforum, it will only search that subforum.
If you search via that search box in the top right while in a topic, it will only search that topic.
The results returned will be sorted by "most relevant". If you want a chronological search, use the "advanced"
search link on the upper left.