The Preview search is not working in Mojave.
I think somebody else in this forum pointed out the same questions before. The searching function in Preview is not functioning under Mojave. The keyword could be found in the same document in Adobe Reader and could be found in the previous OS versions but not this one. This is a disaster to a pdf reader like me.
MacBook Pro with Retina display, OS X Mavericks (10.9.4)