Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua triet » cua viet, su triet, va triet
van hanh » ban hanh, van anh, van ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
ve ban » te ban, va ban, ve bao
ban bo » can bo, ban do, ban co

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

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