Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
cac toc » cac toi, cac nuoc, cac thoi
va hanh » va thanh, va danh, ban hanh
doi cua » dai cua, hoi cua
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (co sach)) ky nang x hoi. hieu ve cac toc ((va hanh) OR (van hanh)) doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (co sach)) ky nang x hoi. hieu ve cac toc ((va hanh) OR (van hanh)) doi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (co sach)) ky nang x hoi. hieu ve cac toc ((va hanh) OR (van hanh)) doi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (co sach)) ky nang x hoi. hieu ve cac toc ((va hanh) OR (van hanh)) doi cua triet*.