There isn't an easy way to delete specific recipes from your searches - that isn't the way a search engine works. If there is a specific author you don't want you can add their name to the search box with - in front which means anything with that name is excluded e.g. -Jane would mean no recipes from anyone with the name Jane would be listed. Or if there is one specific book you want to exclude then - a word or phrase in the title. You can further narrow your searches by fltering only books, magazines or online using the Only Show filters on the right.
Another way is to bookmark the recipes you do want. In this case you would set up a bookmark called Hamachi then each recipe that looks interesting, you bookmark - then next time you want to see your hamachi recipes you can filter just those bookmarked recipes.