Vietnam airlines flight VN-1673 , ATR-72-500 registration VN-B219 from Hai Phong to Da Nang with 41 passengers landed at the Da Nang airport and taxied to parking when after checks they found that one from two nose wheels was missing.

The crew didn't report something during the flight.  After search they found the wheel near the runway inside grass.

(Source: http://airplanes24.net)