Yes, good protein powder will have the added proteins and amino acid listed on the label. That being said your body is really good at breaking down proteins to get the amino acids it needs, and some like whey (which is milk so if you're going vegan won't work) protein are already complete and will have enough of each amino acid that you need unless you are an athlete.

You don't need to worry about "protein combining" and stuff like that. Plants contain all the essential and non-essential too. Here's the actual protein (amino acids) profile of different foods if you're interested.