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
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
vang tuan » van tuan, vong tuan, quang tuan
cua dung » cua dang, cua dong, qua dung
tuan cau » toan cau, quan cau, tuan cu

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 (chieu sang)) - ((hanh trinh) OR (hanh chinh)) cua dung cong vang tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chieu sang)) - ((hanh trinh) OR (hanh chinh)) cua dung cong vang tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) or (chieu sang)) - ((hanh trinh) OR (hanh chinh)) cua dung cong vang tuan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (chieu sang)) - ((hanh trinh) OR (hanh chinh)) cua dung cong vang tuan cau*.