Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
trong van » trong cac
thanh vi » hanh vi, thanh va, thanh ve
tang van » dang van, hoang van, tang luan
qua tham » qua cham, qua than, qua thanh
cua tre » cua te, cuu tre, cua triet
tham so » ham so, tham do, than so
tang ma » mang may
so ban » sao ban, so bang, co ban
vi cua » vai cua, di cua
te cac » tu cac, ve cac, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ky ((tang ma) or (((tang van) OR (trong van)))) hoi. hieu qua tham so ban thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((tang ma) OR (((tang van) OR (trong van)))) hoi. hieu qua tham so ban thanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky ((tang ma) or (((tang van) OR (trong van)))) hoi. hieu qua tham so ban thanh vi cua tre*".