search

You try edit in file : app/code/community/Gala/Rainbowsettings/Helper/Data.php about line 220 :
Code :
try{
    $children = $parent->getChildrenCategories();

    if(count($children) > 0){
        foreach($children as $cat){
            $result .= $this->getCategoriesCustomSearch($cat,$curId);
        }
    }
}
catch(Exception $e){
    return '';
}

Change :

if($parent->getLevel() == 1){
    try{
        $children = $parent->getChildrenCategories();

        if(count($children) > 0){
            foreach($children as $cat){
                $result .= $this->getCategoriesCustomSearch($cat,$curId);
            }
        }
    }
    catch(Exception $e){
        return '';
    }
}