Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
canh trinh » canh tranh, hanh trinh, canh tinh
chong cong » cong cong, thong cong, cuong cong
trinh van » trinh han, trinh quan, trinh toan
van chong » van chuong, van phong, van cong
cong doan » cong dan, cong hoan, dong doanh
doan van » doan va, hoang van, luan van

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 khang)) - canh trinh van chong cong doan van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sang) OR (thieu khang)) - canh trinh van chong cong doan van ban".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sang) OR (thieu khang)) - canh trinh van chong cong doan van ban*.