Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
nang hai » hang hai, nang tai, dang hai
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, tao duoc
va thanh » gia thanh, ban thanh, le thanh
cua tre » cua te, cuu tre, cua triet
va tinh » may tinh
hai hoi » dai hoi, hai moi, hai hai
hai cua » thai cua, dai cua, hoi cua
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 hai hoi. hieu van ((lam duoc) OR (lam thuoc)) ((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 hai hoi. hieu van ((lam duoc) OR (lam thuoc)) ((va thanh) OR (va tinh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su can ky nang hai hoi. hieu van ((lam duoc) OR (lam thuoc)) ((va thanh) or (va tinh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su can ky nang hai hoi. hieu van ((lam duoc) OR (lam thuoc)) ((va thanh) or (va tinh)) hai cua tre*.