The more command that ships with the N900 is a very stripped-down version which does not even provide text search. Fortunately, you can install the program less from the repositories. Unfortunately though, it has problems interpreting the Return key when you use the N900's X Terminal. (It's no problem via an ssh connection, though.)
The fix, luckily, is rather simple: Just enterexport TERM=vt220
before using less.