Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dong
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
su tien » su kien, su hien, tu tieng
v nang » va nang, vu nang, voi nang
x hoi » xa hoi, o hoi, x ho
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) OR (van nang)) x hoi. ((hieu ve) OR (hieu qua)) am thuc day hanh vi su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((v nang) OR (van nang)) x hoi. ((hieu ve) or (hieu qua)) am thuc day hanh vi su tien~".
• Adding a wildcard symbol may retrieve word variants: vu sach ((v nang) OR (van nang)) x hoi. ((hieu ve) or (hieu qua)) am thuc day hanh vi su tien*.