string to one's bow vs workmanship

string to one's bow

noun

  • A skill, ability or resource. 

  • A lover, paramour or suitor. 

workmanship

noun

  • The skill of an artisan or craftsman. 

  • The quality of something made by an artisan or craftsman. 

How often have the words string to one's bow and workmanship occurred in a corpus of books? (source: Google Ngram Viewer )