Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh thu » doanh tai
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
va doanh » van doanh, vay doanh, va danh
cham tuc » nham thuc, pham thuc, tham thuc
thu cua » thuc cua, hu cua, tu cua
hieu ve » hieu va
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
y tang » ky tang, 6 tang, 7 tang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y tang ma hoi. ((hieu ve) OR (hieu van)) cham tuc va doanh thu cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y tang ma hoi. ((hieu ve) or (hieu van)) cham tuc va doanh thu cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y tang ma hoi. ((hieu ve) or (hieu van)) cham tuc va doanh thu cua triet*.