oblique course vs tactic

oblique course

tactic

adj
  • Describing a polymer whose repeat units are identical 

noun
  • A maneuver used against an enemy. 

  • A sequence of moves that limits the opponent's options and results in an immediate and tangible advantage, typically in the form of material. 

  • A maneuver, or action calculated to achieve some end. 

How often have the words oblique course and tactic occurred in a corpus of books? (source: Google Ngram Viewer )