Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
khang cong » hang cong, thanh cong, dang cong
trinh van » trinh han, trinh quan, trinh toan
van khang » van khanh, van thanh, van quang
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
toan ban » van ban

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)) - hanh trinh van khang cong dan ((toan cao) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (hieu qua)) - hanh trinh van khang cong dan ((toan cao) or (toan ban))*.