Does this mean "Do you want more strawberries, or do you want more blueberries? (either/or)", or "Do you want some more strawberries and/or blueberries?"
it says ka not na, so it should be ok to say the strawberry or the blueberry
Perhaps. But it still has to be a good English sentence. What was the full sentence you typed?
They should actually use na then! I mean you could be asking in the singular, like a flavor of icecream... the