Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hang vai » hang tai, hang hai, hang vi
hien cac » thien cac, vien cac, hieu cac
su triet » su viet, su tien, ve triet
cac dua » cach dua, cac qua, cac du
dua ban » dia ban, cua ban, qua ban
tu sach » thu sach, su sach, te sach
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

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 sach v nang ((x hoi) OR (o hoi)). hieu hien cac dua ban ((hang vai) OR (hang va)) su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang ((x hoi) OR (o hoi)). hieu hien cac dua ban ((hang vai) or (hang va)) su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang ((x hoi) OR (o hoi)). hieu hien cac dua ban ((hang vai) or (hang va)) su triet*.