What we did first:
"HÃ¥tveit pÃ¥ 8. plass" to "h_tveit_p_8_plass"


What we do now:
"HÃ¥tveit pÃ¥ 8. plass" to "haatveit_paa_8_plass"


How we do this:
<?php
$string = "HÃ¥tveit pÃ¥ 8. plass";
$res = transliterate($string,
    array('normalize_ligature', 'lowercase_latin',
          'space_to_underscores'),
    'utf-8', 'utf-8');
?>