WordNet (r) 3.0 (2006):

salesmanship
    n 1: skill in selling; skill in persuading people to buy; "he
         read a book on salesmanship but it didn't help"

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "salesmanship":
   advocacy, advocating, allurement, blandishment, bruiting, buildup,
   cajolement, cajolery, coaxing, conning, consumer preference study,
   consumer research, consumer survey, direct-mail selling,
   drumbeating, engagement, enlistment, exhortation, flack, hard sell,
   hawking, high-pressure salesmanship, hortation, huckstering,
   inducement, jawboning, jobbing, lobbying,
   low-pressure salesmanship, mail-order selling, market research,
   marketing, marketing research, merchandising, peddling, persuasion,
   preaching, preachment, promoting, promotion, publicization,
   publicizing, retailing, sales campaign, sales promotion,
   sales talk, selling, sellout, snow job, soft sell, soft soap,
   solicitation, suasion, sweet talk, wheedling, wholesaling,
   working on