Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trang » thanh trung, canh tranh, hanh trinh
theo hieu » theo chieu, theo tieu, thien hieu
cua khong » hua khong, cua phuong, cua thuong
cang tac » canh tac, sang tac, can tac
cong tac » cong ty
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 hieu quang - ((hanh trang) or (nhanh quang)) cua khong ((cang tac) OR (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu quang - ((hanh trang) OR (nhanh quang)) cua khong ((cang tac) OR (cong tac)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu quang - ((hanh trang) or (nhanh quang)) cua khong ((cang tac) OR (cong tac)) toan cau".
• Adding a wildcard symbol may retrieve word variants: theo hieu quang - ((hanh trang) or (nhanh quang)) cua khong ((cang tac) OR (cong tac)) toan cau*.