Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh van » trinh han, trinh quan, trinh toan
hang cong » dang cong, hang nong, bang cong
van hang » van khang, van hoang, van thang
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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) OR (hieu qua)) - canh trinh van hang cong ((van toan) OR (van tuan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (hieu qua)) - canh trinh van hang cong ((van toan) OR (van tuan)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (hieu qua)) - canh trinh van hang cong ((van toan) OR (van tuan)) cao*.