Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
tranh cua » doanh cua, manh cua
van thanh » ban thanh, van tuan
thanh tap » thanh lap, thanh tai, thanh tay

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: doi ((chieu sang) OR (hieu lang)) - hanh tranh cua ((nhung cong) OR (han tong)) van thanh tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (hieu lang)) - hanh tranh cua ((nhung cong) or (han tong)) van thanh tap~".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) OR (hieu lang)) - hanh tranh cua ((nhung cong) or (han tong)) van thanh tap*.