Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
chieu sang » chieu sach, chieu xanh, hieu lang
cua thuong » cua truong, cua phuong, ca thuong
hanh tang » hanh trang, hanh mang, hanh tung
ho chieu » theo chieu, hoc thieu, doi chieu
anh tang » anh bang, anh dang, anh nang
cong tac » cong ty
toan cao » toan ban
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - ((hanh tang) OR (anh tang)) cua thuong cong tac ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - ((hanh tang) OR (anh tang)) cua thuong cong tac ((toan cao) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - ((hanh tang) OR (anh tang)) cua thuong cong tac ((toan cao) or (toan tap))*.