Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
canh trinh » canh tranh, canh tinh, anh trinh
hanh trinh » canh tranh, hanh chinh
dung huong » dung thuong, dung phuong, dong huong
doi chieu » doc hieu, doi chi, ho chieu
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 - ((canh trinh) or (hanh trinh)) xay dung huong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - ((canh trinh) OR (hanh trinh)) xay dung huong dan than cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - ((canh trinh) or (hanh trinh)) xay dung huong dan than cau*.