Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
ve nam » he nam, va nam, le nam
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sac ky)) nang ((xa hoi) or (co hoi)). hieu ve nam thuc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang ((xa hoi) OR (co hoi)). hieu ve nam thuc van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) nang ((xa hoi) or (co hoi)). hieu ve nam thuc van hanh vi cua te*.