Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, tu cach
te sach » toc sach
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
ve can » ve canh, ve cac, ve ban
bo van » vo van, so van, do van

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