Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
chieu sang » chieu sach, chieu xanh, nhieu tang
trinh chua » trinh chuan, trinh cua, trinh chu
hieu lang » hieu quang, nhieu tang, hieu van
chua dong » cua dong, ha dong, huy dong
dong dang » duong dang, dong bang, dung dang
dang van » hoang van, hang va
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (chieu sang)) - canh trinh chua dong dang van ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (chieu sang)) - canh trinh chua dong dang van ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (chieu sang)) - canh trinh chua dong dang van ((toan cau) or (toan cao))*.