hi bosungv89

"Need More Sources" is a status that was shown in LW 4 so that suggests you are using a LW 4 version.

Best techniques are to re-search for the files the way you found them originally. Then 5-10 mins after search finishes, right-click the search tab & choose "Get More Results". Hopefully eventually you will find people with those files.

With LW 4 there are also other tricks you can use.