Perhaps you should try some spelling variations:
trien quang » tran quang, tuyen quang, dien quang
thieu sang » chieu sang, thieu khang, thieu quang
thong cong » trong cong, tong cong, thong thong
tranh cua » doanh cua, manh cua
cua thong » cua thuong, cua khong, cua tong
doan phan » doanh phan, toan phan, doanh nhan
dan phan » dan chan, van phan, dam phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sang) or (trien quang)) - canh tranh cua thong cong ((doan phan) OR (dan phan)) lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (trien quang)) - canh tranh cua thong cong ((doan phan) OR (dan phan)) lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (trien quang)) - canh tranh cua thong cong ((doan phan) OR (dan phan)) lap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (trien quang)) - canh tranh cua thong cong ((doan phan) OR (dan phan)) lap*.