Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
thu sach » tu sach, thuat sach, thuoc sach
hien cac » thien cac, vien cac, hieu cac
hang vai » hang tai, hang hai, hang vi
su triet » su viet, su tien, ve triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
du ban » dua ban, duc ban, du bao
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach v nang ((x hoi) OR (o hoi)). hieu hien cac du ban ((hang vai) or (hang va)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach v nang ((x hoi) OR (o hoi)). hieu hien cac du ban ((hang vai) OR (hang va)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach v nang ((x hoi) OR (o hoi)). hieu hien cac du ban ((hang vai) or (hang va)) su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach v nang ((x hoi) OR (o hoi)). hieu hien cac du ban ((hang vai) or (hang va)) su triet*.