Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hien sach » dien sach, kien sach, thien hach
canh manh » lanh manh, canh tranh, cach mang
hang cong » dang cong, hang nong, bang cong
manh cua » doanh cua, ban cua
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sach - canh manh cua ((nhung cong) or (hang cong)) tan ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - canh manh cua ((nhung cong) OR (hang cong)) tan ((toan cao) OR (toan tap))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien sach - canh manh cua ((nhung cong) or (hang cong)) tan ((toan cao) OR (toan tap))*".