我在创建网站时面临一个问题。我的网站上有一个搜索栏。我试图用中文输入和搜索，但我输入的页面上的搜索词变成了问号和符号。url也相同。我想知道怎样才能使它起作用。只有搜索词会变成这样。有什么解决方案吗？

Updated:这是我的搜索表单（这是一个适用于我的多站点的搜索框）。

<div class="search">
<form name="searchform" onsubmit="return !!(validateSearch() && dosearch());" method="get" id="searchform">
<input type="text" name="searchterms" class="terms" id="terms" placeholder="<?php if (is_search()) { ?><?php the_search_query(); ?><?php } elseif (is_home() || is_single() || is_page() || is_archive() || is_404()) { ?>What are you searching for?<?php } ?>">
<select name="sengines" class="state" id="state">
<option value="" selected>Select a State</option>
<?php $bcount = get_blog_count();
global $wpdb;
$blogs = $wpdb->get_results($wpdb->prepare("SELECT * FROM $wpdb->blogs WHERE spam = \'0\' AND deleted = \'0\' and archived = \'0\' and public=\'1\'"));
if(!empty($blogs)){
    ?><?php
    foreach($blogs as $blog){
        $details = get_blog_details($blog->blog_id);
        if($details != false){
            $addr = $details->siteurl;
            $name = $details->blogname;
            if(!(($blog->blog_id == 1)&&($show_main != 1))){
                ?>
                <option value="<?php echo $addr; ?>?s="><?php echo $name;?></option>
                <?php
            }
        }
    }
    ?><?php } ?>
</select>
<input name="Search" type="submit" value="Search" class="button3">
</form>

</div><!--search-->

Javascript for the search form

function dosearch() {
var sf=document.searchform;
var submitto = sf.sengines.options[sf.sengines.selectedIndex].value + escape(sf.searchterms.value);
window.location.href = submitto;
return false;
}

function validateSearch(){
    // set some vars
    var terms = document.getElementById(\'terms\');
    var state = document.getElementById(\'state\');
    var msg = \'\';

    if(terms.value == \'\'){
        msg+= \'We were unable to search without a keyword! \\n\';
    }

    else if(terms.value.length < 3){
        msg+= \'Keyword is too short! \\n\';
    }

    else if(terms.value.length > 25){
            msg+= \'Keyword is too long! \\n\';
    }

    else if(state.value == \'\'){
        msg+= \'Select state to proceed! \\n\';
    }


    // SUbmit form part
    if(msg == \'\'){
        return true;
    }else{
        alert(msg);
        return false;
    }

}