Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
chieu sang » chieu sach, chieu xanh, nhieu tang
trinh viet » ninh viet, trinh vat
hieu lang » hieu quang, nhieu tang, hieu van
viet dung » viet hung, viet huong, viet trung
dung cong » dung trong
san chan » san chang, dan chan, ban chan
san chay » san pham, van chat, dan chan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) OR (hieu lang)) - canh trinh viet dung cong ((san chan) or (san chay)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - canh trinh viet dung cong ((san chan) OR (san chay)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) OR (hieu lang)) - canh trinh viet dung cong ((san chan) or (san chay)) cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) OR (hieu lang)) - canh trinh viet dung cong ((san chan) or (san chay)) cau*.