Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
trinh toan » tinh toan, thanh toan, trinh han
hoc thieu » toc thieu, hoc hien
trinh van » trinh han, trinh quan, dinh van
cong doan » cong hoan, dong doanh, cong san
cong dan » cong san, cong tan, huong dan

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 - canh ((trinh van) OR (trinh toan)) phong ((cong doan) or (cong dan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh ((trinh van) OR (trinh toan)) phong ((cong doan) OR (cong dan)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - canh ((trinh van) OR (trinh toan)) phong ((cong doan) or (cong dan)) van ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh ((trinh van) OR (trinh toan)) phong ((cong doan) or (cong dan)) van ban*.