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
trinh chu » trinh cau, trinh cho, trinh thuc
nang cong » nang song, dang cong, hang cong
bang cong » dang cong, bang song, hang cong
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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