Perhaps you should try some spelling variations:
dong thuong » cong thuong, dong thong, dung thuong
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu quang » thieu quang, hieu quan, hieu qua
thuong dan » huong dan, thuong han, thuong dam
trung cao » truong cao, trung cap, trung ca
trung co » trung bo, trong co, truong cao
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu xanh) or (hieu quang)) - thanh ((trung cao) OR (trung co)) dong thuong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (hieu quang)) - thanh ((trung cao) OR (trung co)) dong thuong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (hieu quang)) - thanh ((trung cao) OR (trung co)) dong thuong dan than cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (hieu quang)) - thanh ((trung cao) OR (trung co)) dong thuong dan than cau*.