Life and Hand modifier in Gatherer search? And specifying a set?

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In the "advanced" Gatherer search, there are search fields for "Life modifier" and "Hand modifier"?  What do these fields search for?  The help page in Gatherer doesn't say?

Also, how do you search within one set in the advanced search?  In the simple search, you can specify that you only want to search Innistrad, for example.  I don't see that in the advanced search, only "block".
Hand Modifier and Life Modifier are for Vanguard cards

To search for cards from a specific expansion, use the Expansion field.