I was wondering what the fetch xml was from an advanced find today and to get this is suprisingly easy.
All you have to do is run an advanced find.
Press F12
go to the Script tab
type in
resultRender.FetchXml.value
and you shall be rewarded with the FetchXml used to return the results in the advanced find
e.g
"<fetch version="1.0" output-format="xml-platform" mapping="logical" distinct="false"><entity name="customeraddress"><attribute name="name"/><attribute name="postalcode"/><attribute name="telephone1"/><attribute name="customeraddressid"/><order attribute="name" descending="false"/><link-entity name="account" from="accountid" to="parentid" alias="aa"><filter type="and"><condition attribute="accountid" operator="eq" uiname="Hosk Account" uitype="account" value="{F3D4F7ED-74EE-E011-A607-00155D6A3702}"/></filter></link-entity></entity></fetch>"