If you've submitted your listings manually on Trulia, there will be a 'refresh' button next to the property on your listings page.
However, it looks like your listings are getting onto Trulia via a feed. There haven't been any changes made to the No Longer for Sale listings for some time and to make these live again, you need to make a change at the feed source. It can be as small as adding a space or period in the description. This will cause the listing to refresh and be re-fed to Trulia.
If you have questions in the future, I recommend clicking on the Help link in the top-right corner of the page, to reach the Trulia Help Center, and then either search for an answer or click on Contact Us to send a message to Customer Support (link below).
Account Manager | Trulia