Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh han » tranh hang, trinh han, tranh ban
tong cong » trong cong, cong cong, dung cong
dan chan » dan gian, dan ca, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu xanh) OR (chieu tinh)) - hanh tranh han tong cong ((dan chan) or (tinh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu xanh) OR (chieu tinh)) - hanh tranh han tong cong ((dan chan) OR (tinh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu xanh) OR (chieu tinh)) - hanh tranh han tong cong ((dan chan) or (tinh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu xanh) OR (chieu tinh)) - hanh tranh han tong cong ((dan chan) or (tinh toan)) cao*.