Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
thanh tung » thanh cong
cua khong » hua khong, cua phuong, cua thuong
san chang » ban hang, dan chan, van khang
chang dau » hang dau, chang dam, phan dau
cua tong » cua cong, cua dong, cua nong
cong san » cong tac

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)) - thanh tung ((cua khong) or (cua tong)) cong san chang dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - thanh tung ((cua khong) OR (cua tong)) cong san chang dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu quang)) - thanh tung ((cua khong) or (cua tong)) cong san chang dau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu quang)) - thanh tung ((cua khong) or (cua tong)) cong san chang dau*.