>>>Anything I type in and search produce:
>>>
>>>"An unexpected situation has happened. You may return to the main page of the site and proceed"
>>
>>I have adjusted it.
>>
>>Thanks
>
>I know there is a condition that a searched word must have at least three characters, but is this condition also applied if I am searching an exact phase in quotes? e.g. "always on top" where the "on" has only two characters.
>
>I try search "always on top", there is no error prompt nor result, nothing! I am simply brought back to the search dialog...

Each word must be at least 3 characters even in the exact phrase searching.