A topic analysis will help you to clarify and understand what your assessment question is asking you to do.
You will generally be given three key pieces of information:
Your THL105 textual criticism ties together assessment items 1, 2 and 4. This enables you to undertake preliminary analysis on the selected passage using primary sources for Assessment 1.
Then for assessment 2 you are required to prepare the bibliography of at least 6-8 items which demonstrate awareness of a range of relevant resources, such as reference entries, commentaries, journal articles, and web-based sources.
To pull all this together your assessment 4 exegesis paper will draw together aspects of the chosen text, including translation of the text, literary and social contexts and careful discussion of significant issues and questions that arise from the study of the chosen text.
Write down the key concepts from your topic and have a go at brainstorming as many alternative keywords and phrases as possible.
Thinking about your topic in this way forces you to describe your topic in "other words", which will provide you with some useful keyword alternatives as well as help you to cement your understanding of the topic.
Dictionaries and encyclopaedias can help you to find additional keywords and get an overview of the concept.
Oxford Reference Online is a huge repository of subject-specific dictionaries, encyclopaedias, and other reference-type material.