Karma Nakshatras - Good horoscope but no result WHY?

For each lagna, if the 10th house has 8th house planets nakshatra it becomes Karma Nakshatra. 

House Number - Nakshatra

1-Ashwini

2-Mirugasiridam

3-Thiruvadirai

4-Ayilyam

5-Pooram

6-Hastam

7-Chittirai

8-Anusham

9-Pooradam/Moolam/Uthiradam

10-Avittam

11-Purattathi

12-Uthirattathi

Dasha or Bukthi of planets in this Nakshatra would give difficult times.