Perhaps you should try some spelling variations:
ban hanh » ban hang
cham vao » cham va, pham van, chat va
tang van » dang van, hoang van, trong van
cham sao » cham soc, nam sao, cham o
cac kho » cac khoi, cac khoa, cac khu
hieu ve » hieu va, hieu van
tang ma » mang may
cua tre » cua te, cuu tre, cua triet
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) or (tang van)) hoi. hieu ve ((cham sao) OR (cham vao)) ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac kho ((tang ma) OR (tang van)) hoi. hieu ve ((cham sao) OR (cham vao)) ban hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac kho ((tang ma) or (tang van)) hoi. hieu ve ((cham sao) OR (cham vao)) ban hanh vi cua tre*".