Perhaps you should try some spelling variations:
sang than » cang thang, dang thanh, ban than
thien van » thi van
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
sang tao » hang tai
tu cach » tu cac
van cac » van hac, van cau, van bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (tu cach)) ky nang x ho. thien van cac nuoc va ((sang than) OR (sang tao)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu cach)) ky nang x ho. thien van cac nuoc va ((sang than) OR (sang tao)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu cach)) ky nang x ho. thien van cac nuoc va ((sang than) OR (sang tao)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu cach)) ky nang x ho. thien van cac nuoc va ((sang than) OR (sang tao)) cua triet*.