Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
cong luong » cong thuong, nang luong, cong dong
hieu lang » hieu quang, nhieu tang, hieu van
hanh dinh » thanh dinh, hinh dinh, hanh tinh
cong lang » cong vang, cong quang, cong ngang
cu thong » cuoi thong, sau thong, duy thong
dinh cu » dinh cuu, dinh chuc, dinh chau
van cau » van dau, van hau, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sang) or (hieu lang)) - hanh dinh cu thong ((cong lang) OR (cong luong)) van cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu lang)) - hanh dinh cu thong ((cong lang) OR (cong luong)) van cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) or (hieu lang)) - hanh dinh cu thong ((cong lang) OR (cong luong)) van cau*".