Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
vu khanh » vu thanh, van khanh, duy khanh
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
hieu ly » hieu ky, lieu ly, dieu ly
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va thu » va thuc, van thu, va tu
di cua » dai cua, doi cua, de cua

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: ((vu sach) OR (vu khanh)) ky nang ma hoi. hieu ly ((ma thu) OR (va thu)) va hanh di cua viet~.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khanh)) ky nang ma hoi. hieu ly ((ma thu) or (va thu)) va hanh di cua viet*.