Perhaps you should try some spelling variations:
cua viet » hoa viet, cua vat, cua dieu
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ca viet » va viet, co viet, hoa viet
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty tang » tay tang, ty xang, ty hang
ve nam » he nam, va nam, le nam

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

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