I was running into this same situation and was hoping to find the answer in the comments, but it looks like it's still been unanswered.
In case someone else stumbles into the same situation, I was able to combine the "search, then search again, but end up with duplicates" into just one search with OR operands:
~"*(USA*" OR ~"*USA)*" OR ~"*(USA)*"
so it found all of the combinations to be imported in one shot.
EDIT: And then, of course, 15 minutes later, I realize if you just add searching World at the same time, you can combine that step too instead of needing to go back to add it to each section.
~"*(USA*" OR ~"*USA)*" OR ~"*(USA)*" OR ~"*(World)*"
~"*(Europe*" OR ~"*Europe)*" OR ~"*(Europe)*" OR ~"*(World)*"
(but I'm not going to get new pictures)
