As yet I am unable to find a script that will assist players in simply searching Couleur's Transmogrify Database for exactly what they are looking for. However, it is entirely possible! Simply add the following extension to the BlogSpot URL and type the labels as you need: blogspot.com.au/search/label/Label1+Label2
For example: couleurswowdb-weapons.blogspot.com.au/search/label/Black+One-Hand Mace will return any posts or items with the labels Black and One-Hand Mace under the category of Weapons.
Keep in mind that the labels are case-sensitive, so be sure to type the label names as shown down the right-hand side. Otherwise, just copy and paste. Finally, there is no limit to how many labels you can search by at once!