Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
tang van » dang van, hoang van, trong van
thuc dan » thuc hanh, hoc dan, thuc vat
tang ma » mang may
thuc va » thuc vat, thuc day
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((tang ma) OR (tang van)) hoi. hieu ve cam ((thuc va) OR (thuc dan)) thanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky ((tang ma) OR (tang van)) hoi. hieu ve cam ((thuc va) or (thuc dan)) thanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((tang ma) OR (tang van)) hoi. hieu ve cam ((thuc va) or (thuc dan)) thanh vi cua tre*.