This should be the best way to do it:
1. Type hummus into the search box
2. Apply the Recipe Type filter for Dips, spreads & salsas (Recipe Types --> dish types --> Dips, spreads & salsas)
3. Then exclude recipes that have a dip/puree/salsa as an ingredient to eliminate recipes with hummus as an ingredient (Ingredient --> pantry ingredients --> puree/dips/salsas --> click the green + to turn it to a red -)
Doing the search this way, the only recipes you might miss are any "from scratch" hummus recipes that include a puree other than hummus such as canned pumpkin; however, upon closer inspection there were only 3 such recipes in the entire library that were excluded: this, this, and this. Doing it this way tightens up your search considerably, while only missing those three recipes.
Click here to see what the search looks like across the whole library.
Click here to see what the search looks like for only recipes from the library that are available online.
Click on My Bookshelf, and then follow the instructions above to perform the search only across your own bookshelf.
Hope this answers your question!