Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, hieu quan
trien quang » tuyen quang, dien quang, thien quan
nhung cong » dung cong, thong cong, hang cong
tran xuan » tran van
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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 quang) OR (trien quang)) - thanh ((tran xuan) or (tran quang)) nhung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quang) OR (trien quang)) - thanh ((tran xuan) OR (tran quang)) nhung cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu quang) OR (trien quang)) - thanh ((tran xuan) or (tran quang)) nhung cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quang) OR (trien quang)) - thanh ((tran xuan) or (tran quang)) nhung cong san toan cau*.