Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
cang thang » dang thanh
cong thanh » dong thanh, cong trinh, cong tan
cong quang » luong quang, thong quang, duong quang
quang doan » quan doan, quang hoan, quang toan
hang cong » dang cong, hang nong, bang cong
doan ban » doanh ban, toan ban, doan van
va hang » van hang, va nang, va lang

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