Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
bach van » bach dan, cach van, bach dang
ban hanh » ban hang
phan cuc » phan duc, phan cac, pham cuc
cuc ban » cua ban, cac ban, cuu ban
hieu va » lieu va, hieu qua
tu bach » vu bach, tu cach, tu bac
hieu ve » hieu van
cong ha » cong hoa, dong ha, cong tac
lang ha » long ha
vi su » va su, ve su, ki su

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: tu bach van ((lang ha) OR (cong ha)) hoi. ((hieu ve) OR (hieu va)) phan cuc ban hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bach van ((lang ha) or (cong ha)) hoi. ((hieu ve) OR (hieu va)) phan cuc ban hanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: tu bach van ((lang ha) or (cong ha)) hoi. ((hieu ve) OR (hieu va)) phan cuc ban hanh vi su triet*.