Example below is a tutorial on how to find all the Harry Potter Blu-ray covers in the gallery.
First Select Advanced Search.
Enter the search text, check the Type of box
Click Search.
Common Types you might add to a search would be:
Blu-Ray
Standard
Label
For Labels (Disc) you can also check the format box.
Then add one of these to the end of your search
DVD
Blu-Ray
For example to find all Harry Potter DVD Disc Labels in the gallery, just do the above steps, check "Format" as well then enter this:
Harry Potter Label DVD