Ghislain Loas
--- a/library/Class/Catalogue/Loader.php
+++ b/library/Class/Catalogue/Loader.php

    if ($against_ou)
      $against_as_array [] = (count($against_ou) > 1) || $against_as_array
-        ? sprintf('+(%s)', implode(' ', $against_ou))
+        ? sprintf('(%s)', implode(' ', $against_ou))
        : reset($against_ou);

    return ($against_as_array)
-      ? sprintf("MATCH(facettes) AGAINST('%s' IN BOOLEAN MODE)",
+      ? sprintf("MATCH(facettes) AGAINST('+%s' IN BOOLEAN MODE)",
                trim(implode(' ', $against_as_array)))