Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
chu nang » chua nang, cuu nang, chu bang
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan tap » toan ban
chuc » thuc, chua, phuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu xanh) or (chieu sach)) - hanh trinh ((chu nang) OR (chuc nang)) cong san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chieu sach)) - hanh trinh ((chu nang) OR (chuc nang)) cong san toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) or (chieu sach)) - hanh trinh ((chu nang) OR (chuc nang)) cong san toan tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (chieu sach)) - hanh trinh ((chu nang) OR (chuc nang)) cong san toan tap*.