Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cay thuc » cay thuoc, can thuc, day thuc
ban hang » ngan hang
vu sach » vu bach, su sach, vu khach
mang xa » mang may, dang xay, mang cua
lang xa » lang ha, dang xay, lang van
ca thuc » can thuc, va thuc, ca thu
hang vi » hang va, hanh vi, hang di
vi cua » vai cua, di cua

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: vu sach y ((mang xa) OR (lang xa)) hoi. hieu qua ((ca thuc) OR (cay thuc)) ban hang vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y ((mang xa) or (lang xa)) hoi. hieu qua ((ca thuc) OR (cay thuc)) ban hang vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: vu sach y ((mang xa) or (lang xa)) hoi. hieu qua ((ca thuc) OR (cay thuc)) ban hang vi cua triet*.