Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh luan » trinh luat, trinh quan, trinh han
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
van tang » van thang, van trang, van nang
tang ban » tang bang, tiang ban, tang van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (chieu sach)) - canh trinh luan ((nhung cong) OR (dung cong)) van tang ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (chieu sach)) - canh trinh luan ((nhung cong) OR (dung cong)) van tang ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (chieu sach)) - canh trinh luan ((nhung cong) OR (dung cong)) van tang ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (chieu sach)) - canh trinh luan ((nhung cong) OR (dung cong)) van tang ban*.