Perhaps you should try some spelling variations:
luong cong » dung cong, trong cong, cong cong
chi sang » chi lang, chieu sang, chi chang
cong san » cong tac
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
doi chi » doi khi
cong do » cuong do, cong dot, cong so

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sang - thanh cong do luong cong san ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - thanh cong do luong cong san ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: doi chi sang - thanh cong do luong cong san ((toan cau) or (toan cao))*.