Perhaps you should try some spelling variations:
duong trong » dung trong
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
trong mach » trong cac, trong minh, trong anh
cua duong » cua dong, cua huong, qua duong
mach toan » manh toan, hach toan, mach tuan
chu tinh » chau tinh, chua tinh, chu tich
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: theo ((chu tinh) OR (cuu tinh)) - ((hanh tranh) or (hanh trang)) cua duong trong mach toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu tinh) OR (cuu tinh)) - ((hanh tranh) OR (hanh trang)) cua duong trong mach toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu tinh) OR (cuu tinh)) - ((hanh tranh) or (hanh trang)) cua duong trong mach toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chu tinh) OR (cuu tinh)) - ((hanh tranh) or (hanh trang)) cua duong trong mach toan cau*.