There are a number of factors as to why a home is not selling. If you are using Trulia as your one and only source of marketing, that could be a major reason it's not selling. Buyers are searching for homes on the Internet, but they have many options for real estate sites to view homes. There are a variety of ways to market homes to buyers - Internet, open houses, ads, direct mailings, signs, etc.
The number one reason homes do not sell is price. If buyers perceive your home as overpriced for the current market, it will limit the number of showings.
Other reasons for a home not selling include things such as:
bad (or worse, no) photos used in advertising
Have you discussed the lack of showings with your agent? What is his/her opinion as to why your home is not selling?