Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nang co » nang cao, nang doc, nang noi
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
ca tren » cau tren, cu tren, la tren
co hoi » co hoc, co loi
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang co hoi. hieu van cam ((xuc va) or (duc va)) hanh vi ((cua tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang co hoi. hieu van cam ((xuc va) OR (duc va)) hanh vi ((cua tre) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang co hoi. hieu van cam ((xuc va) or (duc va)) hanh vi ((cua tre) or (ca tren))*.