Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, hoa viet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam
vi ca » vit ca, li ca, va ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky sang ((xa hoi) or (ma hoa)). hieu ve nam thuc va hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky sang ((xa hoi) OR (ma hoa)). hieu ve nam thuc va hanh vi ca viet.
• Adding a wildcard symbol may retrieve word variants: su sac ky sang ((xa hoi) or (ma hoa)). hieu ve nam thuc va hanh vi ca viet*.