Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
nam thuc » nam thuoc, am thuc, nam thu
vai cua » dai cua, hai cua, lai cua
so sach » so sanh, bo sach, hoc sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
co sach » bo sach, cuon sach, hoc sach
ma hoi » mai hoi, xa hoi, ma hoa
dam tu » nam tu, cam tu, tam tu

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) or (co sach)) ky nang ma hoi. hieu ve ((nam thuc) or (dam tu)) ban hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ky nang ma hoi. hieu ve ((nam thuc) OR (dam tu)) ban hanh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) ky nang ma hoi. hieu ve ((nam thuc) or (dam tu)) ban hanh vai cua viet*.