What do you mean sequentially? 

Use a "Custom Query" Activity with the query and have it "ORDER BY " the criteria you want. You then can use a "For Each Row" activity to loop through the results in the order they were returned to the workflow. Put your search and tag assignment activities inside the "For Each Row" activity and you will have your intended goal

EDIT:

Once you have the Custom query and the "For Each Row" Activity configured, you will have your Search obviously. But following the search, you need to use a "For Each Entry" Activity to assign the tags since you want to tag however many results come up from the search, and not just the first one.