Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
canh tinh » hanh tinh, manh tinh, canh tranh
tinh quan » tinh quang, trinh quan, tin quan
tong cong » trong cong, cong cong, dung cong
van toan » van tuan, van tan, van thanh
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - canh tinh quan ((nhung cong) or (tong cong)) van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh tinh quan ((nhung cong) OR (tong cong)) van toan cau*.