Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
vat danh » va danh, van danh, luat danh
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
thuc » thu

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 (su sach)) y nang x hoi. ((hieu ve) or (thien van)) am thuc vat danh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang x hoi. ((hieu ve) OR (thien van)) am thuc vat danh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y nang x hoi. ((hieu ve) or (thien van)) am thuc vat danh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) y nang x hoi. ((hieu ve) or (thien van)) am thuc vat danh vai cua triet*.