Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trang » thanh trung, hanh trinh, minh trang
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
cong van » cong vang, cong san, song van
tuan ban » tuan bang, luan ban, quang ban
toan ban » van ban

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