Perhaps you should try some spelling variations:
kho tang » cao tang
cac kho » cac khoi, cac khoa, cac khu
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi
so ban » sao ban, so bang, lo ban
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac kho tang ((ma hoi) or (ma hoa)). hieu ve cham ((so ban) OR (co ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac kho tang ((ma hoi) OR (ma hoa)). hieu ve cham ((so ban) OR (co ban)) hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac kho tang ((ma hoi) or (ma hoa)). hieu ve cham ((so ban) OR (co ban)) hanh vi cua tre*".