Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
thieu sang » chieu sang, thieu khang, thieu quang
thanh tinh » thanh binh, nhanh tinh, than kinh
hoang manh » hoang minh, hoang anh, hoang xanh
cua thuong » cua truong, cua phuong, ca thuong
hoc thieu » toc thieu, hoc hien
cong tam » cong tac, cong tan, cong nam
tri cao » tri co, tri cac, tri nao
tai cao » thai cao, tao cao, tai sao

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 - ((thanh tinh) or (hoang manh)) cua thuong cong tam ((tri cao) OR (tai cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((thanh tinh) OR (hoang manh)) cua thuong cong tam ((tri cao) OR (tai cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - ((thanh tinh) or (hoang manh)) cua thuong cong tam ((tri cao) OR (tai cao))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((thanh tinh) or (hoang manh)) cua thuong cong tam ((tri cao) OR (tai cao))*.