Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
cong thanh » dong thanh, cong trinh, cong tan
hang luong » nang luong, hang thuong, hoang vuong
quang tuan » quang thanh, quang cua
thanh van » thanh san, thanh toan, thanh phan
van hang » van khang, van hoang, van thang

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 (thieu khang)) - cong thanh van hang luong ((quang tuan) or (quan luan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - cong thanh van hang luong ((quang tuan) OR (quan luan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu khang)) - cong thanh van hang luong ((quang tuan) or (quan luan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu khang)) - cong thanh van hang luong ((quang tuan) or (quan luan)) ban*.