Hsieh,
I used the link you specified above to get to the RBD Knowledge Center. When i typed in each of the key words you listed, it found them and presented a list as you would expect.
I had my knowledge center set to English. I did change it to Portuguese/Brazilian and I got the "not found" message. Which language are you using and if you switch to English, does the search work?
I will ask about the other languages. Maybe some indexing needs to be done.
take care.
Mark
markevans