Taoist Mingxia's method was actually quite simple, which was to conduct a dragnet-style search.
However, this type of dragnet search wasn't about mobilizing forces from various major families to carry out a carpet-style search throughout Lanzhou.
That would have simply been delivering heads to the enemy!
Her method entailed inviting Purple Mansion Phase Cultivators from the major families of Lanzhou, then pairing them up and conducting a search of each Individual Cultivator Settlement and small Cultivation Family's gates.
According to her estimates, there were roughly thirty Individual Cultivator Settlements and small family gates that needed to be checked. With three teams working simultaneously, the search could be completed in three days.
If those from the Dragon Transformation Sect were still within Lanzhou's borders, and if they were hiding and recuperating in one of the Individual Cultivator Settlements as she suspected, then this kind of search would surely find them.