Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
quoc tuan » quoc quan, quoc toan, quoc quang
cac quoc » cac nuoc, cac cuoc, cao quoc
hien cac » thien cac, vien cac, hieu cac
dang xay » dang van, van xay
sach ky » sac ky, sach y, sach ty
dang xa » lang xa, dang ha, dang va
su sach » so sach, vu sach
lai va » loai va, mai va, dai va
hai va » hai van, thai va, hoi va

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: su sach ky ((dang xa) OR (dang xay)) hoi. hieu hien cac quoc tuan anh ((lai va) OR (hai va)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((dang xa) OR (dang xay)) hoi. hieu hien cac quoc tuan anh ((lai va) or (hai va)) triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((dang xa) OR (dang xay)) hoi. hieu hien cac quoc tuan anh ((lai va) or (hai va)) triet*.