Microsoft is abandoning its effort to scan whole libraries and make their contents searchable, a sign it may be getting choosier about the fights it will pick with Google. The world’s largest software maker is under pressure to show it has a coherent strategy for turning around its unprofitable online business after its bid for Yahoo, last valued at $47.5 billion, collapsed this month. Digitizing books no longer fits with the company’s plan for its search operation, wrote Satya Nadella, senior vice president of Microsoft’s search and advertising group, in a blog post Friday.