<li><span>simple:</span> (implied) — search in video titles, channel names and playlist titles</li>
<li>
<span>video:</span> — search in video titles, tags and category field
<ul>
<li><span>channel:</span> — channel name</li>
<li><span>active:</span><spanclass="value">yes/no</span> — whether the video is still active on YouTube</li>
</ul>
</li>
<li>
<span>channel:</span> — search in channel name and channel description
<ul>
<li><span>subscribed:</span><spanclass="value">yes/no</span> — whether you are subscribed to the channel</li>
<li><span>active:</span><spanclass="value">yes/no</span> — whether the video is still active on YouTube</li>
</ul>
</li>
<li>
<span>playlist:</span> — search in channel name and channel description
<ul>
<li><span>subscribed:</span><spanclass="value">yes/no</span> — whether you are subscribed to the channel</li>
<li><span>active:</span><spanclass="value">yes/no</span> — whether the video is still active on YouTube</li>
</ul>
</li>
<li>
<span>full:</span> — search in video subtitles
<ul>
<li><span>lang:</span> — subtitles language (use two-letter ISO country code, same as the one from settings page)</li>
<li><span>source:</span><spanclass="value">auto/user</span> — <i>auto</i> to search though auto-generated subtitles only, or <i>user</i> to search through user-uploaded subtitles only</li>