Perhaps you should try some spelling variations:
khong xuong » khong dung, hong vuong, thong duong
hanh trinh » hanh chinh
duoc lieu » du lieu
cua khong » hua khong, cua phuong, cua thuong
xuong dan » huong dan, xuong san, tuong dan
doi lieu » doi chieu, du lieu, tai lieu
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: ((doi lieu) OR (duoc lieu)) tinh - ((canh tranh) or (hanh trinh)) cua khong xuong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi lieu) OR (duoc lieu)) tinh - ((canh tranh) OR (hanh trinh)) cua khong xuong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi lieu) OR (duoc lieu)) tinh - ((canh tranh) or (hanh trinh)) cua khong xuong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi lieu) OR (duoc lieu)) tinh - ((canh tranh) or (hanh trinh)) cua khong xuong dan toan cau*.