Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
chieu xanh » chieu sach, chieu sang, chieu tinh
chau tinh » cuu tinh, ha tinh, cua tinh
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan chan » dan chan, ban chan, can chan
chan cau » phan cau, can cau, chinh cau

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 (chau tinh)) - ((hanh trinh) or (canh tranh)) su dung cong tan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (chau tinh)) - ((hanh trinh) OR (canh tranh)) su dung cong tan chan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chau tinh)) - ((hanh trinh) or (canh tranh)) su dung cong tan chan cau*.