Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
tien anh » tieng anh, tien manh, dien anh
cua hang » cua nhung, cua cong, cua ban
cua dang » cua cong, cua ban
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap

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 ((tien anh) OR (chieu sang)) - canh tranh ((cua hang) OR (cua dang)) cong tap toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tien anh) or (chieu sang)) - canh tranh ((cua hang) OR (cua dang)) cong tap toan cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((tien anh) or (chieu sang)) - canh tranh ((cua hang) OR (cua dang)) cong tap toan cao*.