Trulia IS NOT an MLS. Trulia is a "data syndicator".
The best move you can make now is to team with a RealtorÂ® in the target area you are searching so you have access to TRUE MLS information (and I highly recommend an automated search, which your RealtorÂ® can provide).
If you plan on "going it alone" please review the following post:
MLS Data Accuracy â€“ Where to search if youâ€™re â€œwithout RealtorÂ®â€