Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
hanh trinh » canh tranh, hanh chinh
nho phuong » pho phuong, nho thuong, theo phuong
nhu phuong » thu phuong, nhung phuong, thi phuong
trinh va » trinh van, trinh vat, trinh ve
ban toan » bai toan, ban than, van toan
toan cau » 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: ho ((chieu xanh) or (chieu sang)) - hanh trinh va ((nho phuong) OR (nhu phuong)) ban toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (chieu sang)) - hanh trinh va ((nho phuong) OR (nhu phuong)) ban toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (chieu sang)) - hanh trinh va ((nho phuong) OR (nhu phuong)) ban toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chieu sang)) - hanh trinh va ((nho phuong) OR (nhu phuong)) ban toan cau*.