Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
thieu manh » hieu manh, trieu minh, chieu xanh
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 ((thieu manh) OR (tien manh)) - hanh trang ((cua toan) OR (xuan toan)) phuong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu manh) or (tien manh)) - hanh trang ((cua toan) OR (xuan toan)) phuong dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu manh) or (tien manh)) - hanh trang ((cua toan) OR (xuan toan)) phuong dan toan cau*.