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, hanh trinh
hoang manh » hoang minh, hoang anh, hoang xanh
cua thuong » cua truong, cua phuong, ca thuong
hoc thieu » toc thieu, hoc hien
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tran cao » toan cao, tran chau, trang cho

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