Perhaps you should try some spelling variations:
dung nguong » dung nguon, dung thuong, dung nguoi
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sang » chieu sach, chieu xanh, hieu lang
nguong dan » huong dan
tranh cac » trinh cac, thanh cac, tranh cai
cac dung » cach dung, cac duong, tac dung
dan toan » van toan, dan than, manh toan
toan cau » 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: doi ((chieu tinh) or (chieu sang)) - canh tranh cac dung nguong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu tinh) OR (chieu sang)) - canh tranh cac dung nguong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu tinh) or (chieu sang)) - canh tranh cac dung nguong dan toan cau*.