Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
dung cong » dung trong
cong van » cong vang, cong san, song van
ban tap » bai tap, han tap, ban tai

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: ho ((chieu xanh) OR (chieu sang)) - ((hanh tranh) OR (hanh trang)) su dung cong van ban tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (chieu sang)) - ((hanh tranh) OR (hanh trang)) su dung cong van ban tap~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chieu sang)) - ((hanh tranh) OR (hanh trang)) su dung cong van ban tap*.