Tips on writing literature review 

I am doing part-time PhD from past few months and have been managing my job and research quite well, but I have had some aborted attempts to write the literature review. Recently, I have gone through a bad patch of work. I have tried many different ways to write the literature review, such as mind mapping, just writing, etc. but nothing has come to my rescue and things have turned frustrating now. Can anyone give me few tips on how to write the same? It will be of great help.