Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sach » chinh sach, chiet tach, chieu sang
hien sach » dien sach, thien hach, vien bach
kien sach » dien sach, vien bach, kien mac
tranh va » tranh van, trang va, trinh va
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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: hoc ((((hien sach) OR (chieu sach))) OR (kien sach)) - canh tranh va nhung cong dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hien sach) OR (chieu sach))) or (kien sach)) - canh tranh va nhung cong dan than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((((hien sach) OR (chieu sach))) or (kien sach)) - canh tranh va nhung cong dan than cau*.