Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
hang cong » dang cong, hang nong, bang cong
tranh va » tranh van, trang va, trinh va
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 (kien sach)) - canh tranh va ((nhung cong) OR (hang cong)) dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (kien sach)) - canh tranh va ((nhung cong) OR (hang cong)) dan than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (kien sach)) - canh tranh va ((nhung cong) OR (hang cong)) dan than cau*.