Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
canh trinh » canh tranh, hanh trinh, canh tinh
trinh han » trinh quan
han chong » han chang, nhanh chong, van chuong
cong doan » cong dan, dong doanh, cong san
cong hoan » cong hoa, dong hoa, cong san

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((thieu sang) or (thieu quang)) - canh trinh han chong ((cong doan) OR (cong hoan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sang) OR (thieu quang)) - canh trinh han chong ((cong doan) OR (cong hoan)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sang) or (thieu quang)) - canh trinh han chong ((cong doan) OR (cong hoan)) van ban".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sang) or (thieu quang)) - canh trinh han chong ((cong doan) OR (cong hoan)) van ban*.