Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
duoc tan » duoc ban, duoc dan, duoc tap
ky dang » ky nang, ky danh
xay hoi » tay hoi, cay phoi, gay thoi
hieu ve » hieu va, hieu van
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
ve tao » ve bao, de tao, ve tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky dang ((xay hoi) OR (xa hoi)). hieu ve tao ((duoc tan) or (duc tan)) thanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky dang ((xay hoi) OR (xa hoi)). hieu ve tao ((duoc tan) OR (duc tan)) thanh dai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky dang ((xay hoi) OR (xa hoi)). hieu ve tao ((duoc tan) or (duc tan)) thanh dai cua triet*".