Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
vu sach » vu bach, su sach, vu khach
hieu ve » hieu van
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi
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: vu sach v nang ((x hoi) OR (o hoi)). ((hieu ve) OR (hieu va)) am thuc va hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach v nang ((x hoi) OR (o hoi)). ((hieu ve) or (hieu va)) am thuc va hanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: vu sach v nang ((x hoi) OR (o hoi)). ((hieu ve) or (hieu va)) am thuc va hanh vi su triet*.