When writing a thesis, it is a very important step to consult relevant literature. Here are some ways to obtain relevant literature:

1. Determine the research field and topic, and then search with keywords. You can use academic search engines, such as GoogleScholar, PubMed, WebofScience, etc.

2. Choose reliable sources, such as peer-reviewed journals and discussion papers.

3. Read the abstract and introduction to understand the theme and conclusion of the article.

4. Check the bibliography of the article for more relevant information.