Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
cong thanh » dong thanh, cong trinh, truong thanh
phan dang » phan cong, nhan dan, phan ung
ho chieu » theo chieu, hoc thieu, doi chieu
phan dau » phan tu, hang dau
cong tan » cong tac, cong san, cong ty
toan cao » toan ban, toan tap

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: ho chieu xanh - canh tranh ((phan dang) OR (phan dau)) ((cong thanh) OR (cong tan)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - canh tranh ((phan dang) or (phan dau)) ((cong thanh) OR (cong tan)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - canh tranh ((phan dang) or (phan dau)) ((cong thanh) OR (cong tan)) toan cao*.