Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
hoc chieu » hoc thieu, ho chieu, hoc hien
bang cong » dang cong, bang song, hang cong
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
va bang » va nang, va lang, va ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - hanh trinh va bang cong san ((toan ban) OR (van ban))~.
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - hanh trinh va bang cong san ((toan ban) or (van ban))*.