Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
cong toan » cong tan, cong hoan, cong doan
cong tuan » cong tan, cong luan, cong quang
lanh ban » lanh bang, lang ban, doanh ban
phan dau » phan tu, hang dau
ban cua » ban quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu xanh - lanh ban cua ban ((cong toan) or (((cong tuan) OR (cong thanh)))) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - lanh ban cua ban ((cong toan) OR (((cong tuan) OR (cong thanh)))) phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu xanh - lanh ban cua ban ((cong toan) or (((cong tuan) OR (cong thanh)))) phan dau".
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - lanh ban cua ban ((cong toan) or (((cong tuan) OR (cong thanh)))) phan dau*.