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
hanh ki » hanh vi, hanh ky, hanh kien
su tien » su kien, su hien, tu tieng
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho
ki su » ky 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. ((hieu ve) OR (hieu qua)) am thuc va hanh ki su tien~.
• Adding a wildcard symbol may retrieve word variants: vu sach v nang x hoi. ((hieu ve) or (hieu qua)) am thuc va hanh ki su tien*.