Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, nhung don
hang cong » dang cong, hang nong, bang cong
trinh va » trinh van, trinh vat, trinh ve
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban

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