Perhaps you should try some spelling variations:
cong thanh » cong trinh, truong thanh
thieu sang » chieu sang, thieu khang, thieu quang
dong thanh » truong thanh
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong ty
toan ban » van ban

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 - canh tranh cua dung ((((cong thanh) OR (cong tan))) or (dong thanh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh tranh cua dung ((((cong thanh) OR (cong tan))) OR (dong thanh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - canh tranh cua dung ((((cong thanh) OR (cong tan))) or (dong thanh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh tranh cua dung ((((cong thanh) OR (cong tan))) or (dong thanh)) toan ban*.