Perhaps you should try some spelling variations:
doanh cua » doanh luan
va triet » va thiet, va trien, ve triet
va doanh » van doanh, vay doanh, va danh
sach ky » sac ky, sach ty, sach kem
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
xuc va » duc va, tuc va, luc va
cua va » cua vat, chua va, cua van

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 ky) OR (sach y)) ((lang xa) OR (nang ma)) hoi. hieu va cac xuc va doanh cua va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) ((lang xa) or (nang ma)) hoi. hieu va cac xuc va doanh cua va triet~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) ((lang xa) or (nang ma)) hoi. hieu va cac xuc va doanh cua va triet*.