Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
nam thuc » nam thuoc, am thuc, nam thu
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
va nam » van nam, ha nam, va nay
tu ban » thu ban, te ban
tu can » tu cac, thu canh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu can) or (tu ban)) ky ((nang ma) or (nang x)) hoi. hieu va nam thuc va hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu can) OR (tu ban)) ky ((nang ma) OR (nang x)) hoi. hieu va nam thuc va hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu can) or (tu ban)) ky ((nang ma) or (nang x)) hoi. hieu va nam thuc va hanh hai cua tre*.