Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
canh manh » lanh manh, canh tranh, cach mang
bang cong » bang song, hang cong, dung cong
dang cong » dung cong
doi hieu » doi chieu, doc hieu, doi hien
manh cua » doanh cua, ban cua
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 hieu lang - canh manh cua ((bang cong) or (dang cong)) dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - canh manh cua ((bang cong) OR (dang cong)) dan toan cau*.