Well I'm not going to list them all, but for the ones you have mentioned:
Okashi - It's like a feeling of someone doing a bad thing without really expressing it, but someone else can see the other's wrong doing.
Poh - just look at the face, It's like saying Doh, in a fun way.
Emblaugh - I wouldhave to say, as a some Japanese girls laugh, they cover their mouths, or you could use this as saying, "he he he"
Finally, if you just look at the faces, if can get a pretty good idea of what is going on.