Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hac loai » cac loai, lac loai, phan loai
dang xay » dang van, van xay
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
loai va » loai nam
van hac » van hoc, van ha, van hai
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
te cao » te bao
vi cua » vai cua, di cua
te cac » tu cac, ve cac, de cac

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: ((te cac) OR (te cao)) ky ((nang xa) OR (dang xay)) hoi. hieu van hac loai va danh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cac) OR (te cao)) ky ((nang xa) or (dang xay)) hoi. hieu van hac loai va danh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te cac) OR (te cao)) ky ((nang xa) or (dang xay)) hoi. hieu van hac loai va danh vi cua tre*.