The "NEWCOMERS: PLEASE READ FIRST" announcement, and other threads, contains a
link to the ultimate thread on searching.
Anyway, for searches involving exremely common words os usink keywords of three or fewer characters, enclose the terms in quotation marks.
737 won't work, but
"737" will. Searching on
blocking will also reveal
this thread.
As 737s get some more seats, this feature will disappear.