I am planing to write down a review paper, and I need to collect the maximum number of publications that are relevant to the subject. As such, I am curious to know how to find out the best way for that.
Look at the few recent reviews. People now often use special software for collecting written evidence for reviews.
You may also find the below references useful:
Abou-Setta, A. M., M. Jeyaraman, A. Attia, H. G. Al-Inany, M. Ferri, M. T. Ansari, C. M. Garritty, K. Bond and S. L. Norris (2016). "Methods for Developing Evidence Reviews in Short Periods of Time: A Scoping Review." PLOS ONE 11(12): e0165903.
Phan, K., D. H. Tian, C. Cao, D. Black and T. D. Yan (2015). "Systematic review and meta-analysis: techniques and a guide for the academic surgeon." Annals of Cardiothoracic Surgery 4(2): 112-122.