Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
kho tang » cao tang
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, ma hoa, me hoi
vi cua » vai cua, di cua

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

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