Hey dad? How do I fix this?

It is the second or third time we have screwed them back in since we moved in. I'm certain that they are stripped at this point.

Edit: I wasn't able to find a tool that does the sort of 'expand' thing when you screw into it (I think it's called an anchor?) What mom and I ended up doing was using longer screws. The screws that were already installed in the door were roughly 3/4 inch long. We put brand new screws in that were about 1 1/2 inch long. We have a bathroom door again, so I guess it worked? Thank you all for your advice. I don't have the money to do any major repairs or replacements.