Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
trieu minh » trieu tinh, trien minh, trien kinh
phuong dan » phuong danh, phuong doan, huong dan
tien manh » tien anh, tien thanh, tieng anh
cua toan » cuu toan, cua thanh, cua doanh
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((trieu minh) OR (tien manh)) - hanh tranh ((cua toan) OR (xuan toan)) phuong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((trieu minh) or (tien manh)) - hanh tranh ((cua toan) OR (xuan toan)) phuong dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((trieu minh) or (tien manh)) - hanh tranh ((cua toan) OR (xuan toan)) phuong dan toan cau*.