Go to the search bar to the top right and type "invis" or whatever spell effect you want. It will list the spell effect, click on it and then scroll down to see all the items with that effect. That's what I do when I'm looking for something with a certain effect.
Also if spell has an effect that's the same as another you can type in both terms to get different items, such as invis and gather shadows. I also use it for my mage when looking for pet focus. Pet focus brings up all the pet focus strengths and you can click on them to see what items have it on them.