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
thanh toan » thanh hoa, thanh san, tinh toan
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
van than » van thanh, van thang, van tuan
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) OR (chieu sang)) - hanh trinh va dung cong ((thanh toan) or (van than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sang)) - hanh trinh va dung cong ((thanh toan) OR (van than)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) OR (chieu sang)) - hanh trinh va dung cong ((thanh toan) or (van than)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) OR (chieu sang)) - hanh trinh va dung cong ((thanh toan) or (van than)) ban*.