Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
cong thanh » dong thanh, cong trinh, cong tan
hieu lang » chieu sang, nhieu tang, hieu van
tranh cua » doanh cua, manh cua
dong cong » duong cong, dung cong, dang cong
cua dong » chua dong, cua cong, cua dang
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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) OR (hieu quang)) - canh tranh cua dong cong thanh ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - canh tranh cua dong cong thanh ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - canh tranh cua dong cong thanh ((toan cau) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - canh tranh cua dong cong thanh ((toan cau) or (toan ban))*.