There's some solid suggestions above, but it helps knowing what to look for - here's some suggestions for search terms on some of the above sites people have listed:
"Sword shing" (also try with "knife")
"Sword ring" (also try with "knife")
Sword whoosh (also try whoosh by itself, and "arm whoosh," "punch whoosh," "kick whoosh," and "cloth whoosh")
You can swap the word "sword" out for "cloth" if you have a lot of character movement, capes, etc.
For the backgrounds:
Nature ambience / nature ambient
Try other adjectives as you see fit like "forest," "birds," etc.
I'd also recommend "light wind," "wind trees," etc. since a constant subtle wind track helps a lot in most "outdoor wilderness" scenes.