Yes I believe that Salat-tazbi is very effective. Recite Durud-e-Tanjeena 369 times any day, it can be done in a group and its very effective. My family does it for all important situations and we have never been disappointed alhamdullilah. Also, we make an intention of listening to 'Bibi Sagat ki Kahani' after we achieve our goal and that never fails us either. If you want to recite something individually, then personally Durud-e-Awwal is very good. Recite it 313 times prefereably after Salat Zuhr or Isha.
Wazeefey are very very effective during these tough times.