Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
va thanh » gia thanh, ban thanh, le thanh
dai hoi » dai hoc, dai hai, dai moi
van lam » van nam
va tinh » may tinh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
su can » su van, su cao, tu can
can ky » van ky, dan ky, ban ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su can ky nang dai hoi. hieu van lam duoc ((va thanh) or (va tinh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su can ky nang dai hoi. hieu van lam duoc ((va thanh) OR (va tinh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su can ky nang dai hoi. hieu van lam duoc ((va thanh) or (va tinh)) hai cua tre*.