Generally choose names with premium letters (A, B, E etc.) not less common letters (Q, X, Z).

Then search Google for "LLL India" and see what you find. If lots of companies use that acronym, its a good domain.

Rightly said by steve, the domain names must be unique and must hold some significance. Firstly the domain names representing common three letter words fill up and then those which can be used as a nice abbreviations to bigger site names.