Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu cua » hieu qua, dieu cua, bieu cua
tai cac » tai cuc
tai cau » tai cao
thuc va » thuc vat, thuc dan, thuc day
hoc anh » hoc nganh, hoc nhanh, ngoc anh
nang ma » tang ma, sang ma, mang may
cua nam » cua tam, cua ngan, cua nhan
anh ky » hanh ky, anh y, anh my
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc anh ky ((nang ma) or (nang cao)) hoi. hieu cua nam thuc va dau ((tai cau) or (tai cac)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc anh ky ((nang ma) OR (nang cao)) hoi. hieu cua nam thuc va dau ((tai cau) OR (tai cac)) treo.
• Adding a wildcard symbol may retrieve word variants: hoc anh ky ((nang ma) or (nang cao)) hoi. hieu cua nam thuc va dau ((tai cau) or (tai cac)) treo*.