Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hang nhung » sang nhung, hanh nhung, hong nhung
tranh cua » doanh cua, manh cua
nhung tap » nhung bai, nhung cau, chung ta
cua hang » cua dang, cua nhung, cua cong
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.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((dieu hanh) or (chieu xanh)) - canh tranh cua hang nhung tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((dieu hanh) OR (chieu xanh)) - canh tranh cua hang nhung tap toan cao.
• Adding a wildcard symbol may retrieve word variants: doc ((dieu hanh) or (chieu xanh)) - canh tranh cua hang nhung tap toan cao*.