Perhaps you should try some spelling variations:
trien quang » tran quang, tuyen quang, dien quang
thieu sang » chieu sang, thieu khang, thieu quang
cua thuong » cua truong, cua phuong, ca thuong
cua thong » cua khong, cua tong, suat thong
cong doan » cong dan, cong hoan, dong doanh
doan phan » doanh phan, toan phan, dan phan
phan cac » nhan cach, phan dau, phan lap

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