Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hien sang » hien trang, khien bang, chieu sang
tranh cua » doanh cua, manh cua
cua tong » cua cong, cua dong, cua nong
cong hag » cong hai, cong hat, cong hay
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
cong ha » cong hoa, dong ha, cong tac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sang - hanh tranh cua tong ((((cong ha) or (cong hag))) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sang - hanh tranh cua tong ((((cong ha) OR (cong hag))) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - hanh tranh cua tong ((((cong ha) or (cong hag))) or (cong san)) toan cau*.