Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh
hieu van » hieu va, thien van, hieu ve
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
cac dac » cac dan, cac dai, cac bac
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. ((hieu van) OR (lieu va)) cac dac ((ban thanh) or (ban hang)) dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((hieu van) OR (lieu va)) cac dac ((ban thanh) OR (ban hang)) dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu van) OR (lieu va)) cac dac ((ban thanh) or (ban hang)) dai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu van) OR (lieu va)) cac dac ((ban thanh) or (ban hang)) dai cua triet*.