Perhaps you should try some spelling variations:
phuong hang » phuong hoang, phuong bang, phuong hanh
nhieu tang » chieu sang, hieu lang, nhiet nang
chieu xanh » chieu sach, chieu sang, chieu tinh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh doan » trinh toan, thinh doan, trinh dan
toan cau » toan cao, toan ban, toan tap
va toan » van toan, bai toan, tap toan

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 ((nhieu tang) OR (chieu xanh)) - canh trinh doan phuong hang va toan cau~.
• Adding a wildcard symbol may retrieve word variants: ho ((nhieu tang) or (chieu xanh)) - canh trinh doan phuong hang va toan cau*.