Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
tac van » tac vang, cac van, tac va
hanh di » hanh vi, hanh de, hang di
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (co sach)) ky nang ((x hoi) or (xa hoi)). hieu ve cac tac van hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang ((x hoi) OR (xa hoi)). hieu ve cac tac van hanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang ((x hoi) or (xa hoi)). hieu ve cac tac van hanh di cua triet*.