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, hanh trang
dung cong » dung trong
tranh su » trinh su, trang su, tranh cua
cong van » cong vang, cong san, song van
ban tap » bai tap, ban tai, ban tay
han tap » han tai, toan tap, nhan 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 su dung cong van ((ban tap) OR (han tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (chieu sang)) - hanh tranh su dung cong van ((ban tap) OR (han tap))~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chieu sang)) - hanh tranh su dung cong van ((ban tap) OR (han tap))*.