Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
vat hanh » vat thanh, van hanh, va hanh
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu 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: tu sac ky ((nang cao) OR (dang xay)) hoi. hieu van cau thuc vat hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang cao) or (dang xay)) hoi. hieu van cau thuc vat hanh vi cua tre*.