Perhaps you should try some spelling variations:
cua triet » su triet, va triet
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
hieu van » thien van, lieu va, hieu ve
thu ban » thu hang
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ca thu » cac thu, cam thu, ca tru
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang ma hoi. ((hieu van) OR (hieu va)) ca thu ban thanh van ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ma hoi. ((hieu van) OR (hieu va)) ca thu ban thanh van ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang ma hoi. ((hieu van) OR (hieu va)) ca thu ban thanh van ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ma hoi. ((hieu van) OR (hieu va)) ca thu ban thanh van ((cua triet) or (cua viet))*.