http://telepathy.freedesktop.org/spec/Channel_Type_Contact_Search.html Sametimes should at least support it: https://bugzilla.gnome.org/show_bug.cgi?id=666156
This probably requires libpurple work: many actions in prpls are not really suitable for use in Haze, since their API is essentially "here is a list of menu items" and "please display a window that looks like this". I seem to remember contact search is one of these, in which case it'll need a "machine-readable" API in libpurple before Haze can interact with it.
here is a bug in the launchpad i have make it its downstream. https://bugs.launchpad.net/empathy/+bug/868024
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