I am not exactly sure if Truilia is sweeping from trustee websites (a 3rd party that handles the process of a home in foreclosure) or where exactly Truila gets ALL of their homes posted for sale. If that is the case then Truilia is gathering data on foreclosures that are headed to auction... it is difficult to buy any of those homes if you don't have cash for the purchase. At auction... you have to pay by cashier's check for the property and it becomes (almost instantly) yours. Being you are obtaining a loan to purchase your home as a first time homebuyer... this isn't an option for you and could be why your agent hasn't shown you properties accordingly.
That being said... you can take advantage of looking for properties with your agent that are in the "pre-foreclosure" process or are short sales. They are very tricky to handle though and your agent needs to know how to work this market. Lots of patience needs to be involved and you will need to be prepared to try several attempts at buying this way. Properties in default, such as preforeclosure, are listed in most agent databases (MLS) and are still capable of being bought through the typical process, hosted by an agent.
Foreclosures are a whole different animal that are bought by people with investment cash. In order to get super low prices on properties such as these, you have to have cash sitting in an account waiting to purchase. This strenghtens your negotiating power and gives a buyer the possbility (notice I say possibility) of buying real estate for super cheap. There are very small sectors of the population that are capable of buying this way.
Your agent is probably doing right by you... sounds like you need a little more clarification on why those other properties might be out there.
With that said, their are a lot of agents who try to avoid showing "Short Sales" or "Pre-Foreclosures" even if it mean a better opportunity for the client. These types of transactions tend to reduce agents commissions and can be very difficult to deal with, something Agents try to avoid.
Be sure that your agent is clear about YOUR goals........ after all it is you who is going to responsible for the monthly payments, NOT your agent. Good luck!