You gather literature based on four major principles (that I have seen or worked with); namely, thematic issues treated in literature (e.g. whether 'identity construction' or 'face management', etc), or data types/sets used (e.g. 'literary texts' or 'oral interview', etc), or theoretical/conceptual approach employed in analysing data (e.g. 'rapport-management' or 'deixis', etc), or methods used in collecting (e.g. 'interview' or 'observation', etc), sampling (e.g. 'random' or 'clustered', etc), presenting (e.g. 'pilot' or 'numbered', etc), and analysing (e.g. 'quantitative' or qualitative', etc) data, or a combination of two or more of these.
Generally speaking, the literature review is guided by the key variables in the research title in which the theories related to them are mentioned in a sub-heading called " Theoretical Background" . Alternatively, the works conducted in the same area are accommodated within another sub-heading ; namely, "Empirical Background". Finally, the gap existing in the literature which you your research tends to fill should be explained followed by the purpose of the research you want to conduct. For more information, the following link can hopefully satisfy what you are looking for.