title: Boolean OR doesn't seem to work in Youtube APIv3 list search
body: <p>I am trying to search videos with different keywords. When I use multiple keywords with OR then it is showing empty results.</p>
  <pre><code>GET https://www.googleapis.com/youtube/v3/search?part=id%2Csnippet&amp;publishedAfter=2017-07-07T00%3A00%3A00Z&amp;q=Social+Media+Artificial+Intelligence+Assistant%7CSocial+Media+Artificial+Intelligence+Automation%7CDigital+Marketing+Artificial+Intelligence+Assistant&amp;relevanceLanguage=en&amp;type=video&amp;key={YOUR_API_KEY}
  </code></pre>
  <p>When I try individual keywords, it is showing results. Say,</p>
  <pre><code>GET https://www.googleapis.com/youtube/v3/search?part=id%2Csnippet&amp;publishedAfter=2017-07-07T00%3A00%3A00Z&amp;q=Social+Media+Artificial+Intelligence+Assistant&amp;relevanceLanguage=en&amp;type=video&amp;key={YOUR_API_KEY}
  </code></pre>
  <p>I tried multiple ways &quot;A|B&quot; , &quot;A | B&quot; nothing worked. Im checking directly on their API explorer <a href="https://developers.google.com/apis-explorer/#p/youtube/v3/youtube.search.list?part=id%252Csnippet&amp;publishedAfter=2017-07-07T00%253A00%253A00Z&amp;q=Social%20Media%20Artificial%20Intelligence%20Assistant&amp;relevanceLanguage=en&amp;type=video&amp;_h=16&amp;" rel="nofollow noreferrer">here</a></p>
  <p>Any clues?</p>