Hi. In robot_functions.php is $separators = " "; and this is what breaks on space for keywords. You could add other characters to $separators, but I am not familiar enough with Japanese to suggest appropriate separators. 
One other thing from php.net:
Quote:
Character encodings work with PHP:
ISO-8859-*, EUC-JP, UTF-8
Character encodings do NOT work with PHP:
JIS, SJIS
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