title: get more than 10 results Google custom search API
body: <p>I am trying  to use Google custom search API,what I want to do is search the first 20 results, I tried changing the <code>num=10</code> in URL to 20 but gives 400 Error, How can I fix or requests the second page of results ?(Note I am using search entire web)</p>
  
  <p>Here is the code I am using</p>
  
  <pre><code>import requests,json
  url="https://www.googleapis.com/customsearch/v1?q=SmartyKat+Catnip+Cat+Toys&amp;cx=012572433248785697579%3A1mazi7ctlvm&amp;num=10&amp;fields=items(link%2Cpagemap%2Ctitle)&amp;key={YOUR_API_KEY}"
  res=requests.get(url)
  di=json.loads(res.text)
  </code></pre>