Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
canh trinh » canh tranh, hanh trinh, canh tinh
chieu sang » chieu sach, chieu xanh, nhieu tang
chuan dong » chua dong, chuan long, chuyen dong
hieu lang » hieu quang, nhieu tang, hieu van
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 chuan 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 chuan dong dang van ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) OR (chieu sang)) - canh trinh chuan dong dang van ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) OR (chieu sang)) - canh trinh chuan dong dang van ((toan cau) or (toan cao))*.