Door automatic closer - Can it be tightened?
That is a 35mm cup hinge, sometimes known as a Euro hinge. 

They wear out over time, so replacement is a cheap and cheerful option. If you buy a cheap one (say, at a big box store), you'll need to replace it at some point; if you buy a Blum/ Hafele/ Salice or other high-end replacement, it'll last as long as the cabinet.

When buying, you'll be faced with a staggering number of options regarding "overlay" and opening angle. Best bet is to remove the existing hinge and bring it into a brick/mortar place. Otherwise, a bit of work googling will allow you to match it up. One other option: you can get ones that clip on (as opposed to being screwed in place), which is very convenient.

Be gentle with the screwdriver when re-attaching the hinges... particle board won't take much abuse. A toothpick and some glue in the hole might help if things feel loose.