Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
nang hai » hang hai, nang tai, dang hai
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, le thanh
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
va tinh » may tinh
van lam » van nam
hai hoi » dai hoi, hai moi, hai hai
tu can » tu ban, tu cac, thu canh
su can » su van, su cao, su han

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) OR (tu can)) ky nang hai 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) OR (tu can)) ky nang hai hoi. hieu van lam duoc ((va thanh) OR (va tinh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su can) OR (tu can)) ky nang hai hoi. hieu van lam duoc ((va thanh) or (va tinh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su can) OR (tu can)) ky nang hai hoi. hieu van lam duoc ((va thanh) or (va tinh)) hai cua tre*.