If "you" are looking for your own content, then click on "Find threads" under Forums:
You will see the following:
For the threads you created, click on "Your threads" (default tab). For the threads which include your posts, click on "Threads with your posts". So there is no duplication.
If "someone else" is looking for your content, then Advanced Search is much better for grouping on threads:
www.mrexcel.com
Fill posted by with your user name (additionally keyword, time etc...).
Select "Display results as threads", so no duplicates for each post.
Soon, there will be a "Older than" option that will let making search between two days.
More info.
Additionally, I always recommend using Bookmarks system for creating your own library as future reference. You can create labels for easy filtering, and name the bookmarks as you need.
Hopefully this helps.