Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dang xay » van xay
dang van » hoang van, hang va
hac loai » cac loai, lac loai, phan loai
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
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((nang xa) OR (((dang xay) OR (dang van)))) 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 ky ((nang xa) or (((dang xay) OR (dang van)))) hoi. hieu van hac loai va danh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te cac ky ((nang xa) or (((dang xay) OR (dang van)))) hoi. hieu van hac loai va danh vi cua tre*.