Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trinh, hanh trang
cua thuong » cua truong, cua phuong, ca thuong
tranh cua » doanh cua, manh cua
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) OR (chieu sach)) - hanh tranh cua thuong cong ((dan toan) or (tinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chieu sach)) - hanh tranh cua thuong cong ((dan toan) OR (tinh toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (chieu sach)) - hanh tranh cua thuong cong ((dan toan) or (tinh toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (chieu sach)) - hanh tranh cua thuong cong ((dan toan) or (tinh toan)) cau*.