SharePoint搜索查询

Question

我有一个单词（docx）文档存储在OneDrive for business上。它具有如下的结构：

<title> 
Book Title 
</title> 
<author> 
High 
</author> 

然后我用Microsoft.SharePoint.Client搜索标题和作者

var targetSite = new Uri("https://my-site.sharepoint.com"); 
    var login = "login"; 
    var password = "pass"; 
    var securePassword = new SecureString(); 
    foreach (char c in password) 
    { 
     securePassword.AppendChar(c); 
    } 
var onlineCredentials = new SharePointOnlineCredentials(login, securePassword); 

using (ClientContext clientContext = new ClientContext(targetSite)) 
{ 
    clientContext.Credentials = onlineCredentials; 

    var query = new KeywordQuery(clientContext); 
    query.QueryText = "<title></title><author></author>"; 
    var searchExecutor = new SearchExecutor(clientContext); 
    var result = searchExecutor.ExecuteQuery(query); 
    clientContext.ExecuteQuery(); 

} 

但它不工作。它只返回单词标题和作者。我究竟做错了什么？