Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
gian cac » gian dan, gian cua
va hanh » van hanh, va thanh, va danh
mai hoi » mai khoi, dai hoi, lai hoi
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
y sang » _ sang, duy sang
ma hoi » xa hoi, ma hoa, me hoi
tuc va » thuc va, truc va, tuc xa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y sang ((ma hoi) OR (mai hoi)). hieu ((gian cac) OR (vien bach)) tuc va hanh vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y sang ((ma hoi) OR (mai hoi)). hieu ((gian cac) or (vien bach)) tuc va hanh vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y sang ((ma hoi) OR (mai hoi)). hieu ((gian cac) or (vien bach)) tuc va hanh vai cua viet*.