Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
hoc sach » hoc sinh, hoc cac, hoc anh
nang cau » nang cao, hang cau, nang dau
lam thuc » lam thuoc, am thuc, nam thuc
thanh vi » hanh vi, thanh va, thanh ve
cua viet » ca viet, cua vat, cua dieu
so sanh » do sanh
hieu ve » hieu va, hieu van
ve lam » va lam, de lam, se lam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (so sanh)) ky nang cau hoi. hieu ve lam thuc vat thanh vi ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (so sanh)) ky nang cau hoi. hieu ve lam thuc vat thanh vi ((cua viet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (so sanh)) ky nang cau hoi. hieu ve lam thuc vat thanh vi ((cua viet) or (hoa viet))*.