I tried searching on Android Studio 3.1 Beta 2 and it's works fine. However on Android Studio 3.0.1 search doesn't work. I guess there is no way to fix it exept updating IDE. You can try Android Studio 3.1 Beta 2, follow the link for downloading: https://developer.android.com/studio/preview/index.html
Note: don't update your stable version to beta. Instead install alongside your stable version: https://developer.android.com/studio/preview/install-preview.html
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