Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cua triet » cua viet, su triet, va triet
viec cac » vien cac, viec cua, viec lam
ban hanh » ban hang
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
nang ma » tang ma, sang ma, nang cao
cac toc » cac toi, cac nuoc, cac thoi
toc ban » toc san, toc ba, hoc ban
ma hoi » mai hoi, xa hoi, ma hoa

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 viec cac toc ban hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ky nang ma hoi. hieu viec cac toc ban hanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) ky nang ma hoi. hieu viec cac toc ban hanh dai cua triet*.