Question - Selection (when using magic wand tool)

I am trying to learn and use selections... I have a image from which I want to extract only the complete faces of some people. it's a tough one since the background and the hair are difficult to distinguish for some people even when using the magic wand. What I am trying is (while using the magic wand tool) is that I click on part of the image and if feels that the selection is correct then i do a right click and then select "Add to selection"...

Question: Once I have done so a couple of times, can I somehow display/show the intersection (SUM) of all the areas that I had added as selection and then either copy/paste or do somethiing.

Will be very very thankful for help and reply from anyone please.

After making the selection you can do a cmd + j (ctr + J on PC) to copy the selection to its own new layer.

I don't know if I fully understand your question. so if this doesn't answer it, just post back.