Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
cac loai » cac bai, cac giai, cac dai
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
loai va » loai nam
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
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: te sac ky ((nang xa) OR (dang xay)) hoi. hieu van cac loai va hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (dang xay)) hoi. hieu van cac loai va hanh vi cua tre*.