Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
su tien » su kien, su hien, tu tieng
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
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 o hoi. ((hieu ve) OR (hieu qua)) am thuc va hanh vi su tien~.
• Adding a wildcard symbol may retrieve word variants: vu sach v nang o hoi. ((hieu ve) or (hieu qua)) am thuc va hanh vi su tien*.