Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
hac loai » cac loai, lac loai, phan loai
van hac » van hoc, van ha, van hai
loai va » loai nam
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cuu tre » cua tre, cau tren, cau treo
te sai » te tai, te bai, te lai
sai ky » sac ky
vi cuu » vi luu, vinh cuu

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 sai ky ((nang x) OR (dang xay)) hoi. hieu van hac loai va danh vi cuu tre~.
• Adding a wildcard symbol may retrieve word variants: te sai ky ((nang x) or (dang xay)) hoi. hieu van hac loai va danh vi cuu tre*.