those are normal weak two openings. may be with only 5 card if the hand is in range 8-11 HCP and the suit is good (2 big honors). modified 2NT ogust:
3C = 5 card suit, 8-11 HCP
3D = weak hand, weak suit (6 cards)
3H = weak hand, good suit (for example KQJxxx and out)
3S = good hand, weak suit (for example Axxxxx x KQx xx)
3NT = good hand, good suit (for example KQxxxx x KQx xxx)