Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
luat huong » luat thuong, suat huong, xuat thuong
hieu lang » chieu sang, hieu quang, nhieu tang
luat hang » luat hanh, luat chung, luat thanh
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » toc thieu, hoc thieu, hoc hien
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: doc hieu lang - canh trinh ((luat hang) or (luat huong)) cong manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - canh trinh ((luat hang) OR (luat huong)) cong manh toan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - canh trinh ((luat hang) or (luat huong)) cong manh toan cau*.