Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
canh trinh » canh tranh, hanh trinh, canh tinh
chieu sang » chieu sach, chieu xanh, hieu lang
dien anh » tieng anh, dien dan
trinh va » trinh van, trinh vat, trinh ve
cong tac » cong ty
doan cao » doanh cao, toan cao, hoang cao
doan cap » doanh cao, dan ca, toan cao

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: theo ((dien anh) OR (chieu sang)) - canh trinh va thuong cong tac ((doan cao) OR (doan cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((dien anh) or (chieu sang)) - canh trinh va thuong cong tac ((doan cao) OR (doan cap))~".
• Adding a wildcard symbol may retrieve word variants: theo ((dien anh) or (chieu sang)) - canh trinh va thuong cong tac ((doan cao) OR (doan cap))*.