Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
cua truong » cua trung, xuan truong, cac truong
cua thong » cua thuong, cua khong, cua tong
hoc hieu » hoc thieu, doc hieu, hoc dieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hieu) or (hoc hien)) cach - hanh tranh ((cua thong) or (cua truong)) cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (hoc hien)) cach - hanh tranh ((cua thong) OR (cua truong)) cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (hoc hien)) cach - hanh tranh ((cua thong) or (cua truong)) cong dan toan cau*.