VN-Index drops for second day amid profit taking.The market fell again today as investors appeared to take profits after a three-week rally. The index opened higher and reached just shy of 670, but by mid-morning it was back in negative territory and never got much traction the rest of the session, closing down 2.13 points, or 0.3%, to 664.56. VCB (-3.6%), by far the top contributor to the index's fall, has slumped 6.1% in the last two days after jumping 24% since June 27.