Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
trinh quan » tinh quang, trinh luat, trinh han
danh thanh » dinh thanh, dang thanh, nhanh thanh
hoc thieu » toc thieu, hoc hien
trinh qua » trinh cua, trinh quang, trinh luat
ban thanh » ban hanh, ban hang

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