Searchanise Search & Filter

This is the ONLY APP I've found that can handle partial-word searches (you know, that really basic function vital to all websites with more than 3 products that Shopify has mysteriously left out of their functionality.)

This app does a lovely job and allows customers to search partial words, SKU numbers and can even handle synonyms! I highly recommend it, especially since Shopify refuses to do ANYTHING about this giant hole in their service...