Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
dau tren » dau tien, dat tren, dau tieng
hoc cac » hoc cao
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
co loi » co hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc cac ky nang co loi. ((hieu ve) or (hieu van)) nam thuc va hanh va ((cua tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc cac ky nang co loi. ((hieu ve) OR (hieu van)) nam thuc va hanh va ((cua tre) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: hoc cac ky nang co loi. ((hieu ve) or (hieu van)) nam thuc va hanh va ((cua tre) or (dau tren))*.