1. Determine the research topic: First, you need to define your research topic and research question. This will help you determine what kind of documents you need to look for.
2. Use academic databases: Use academic databases such as GoogleScholar, JSTOR and PubMed. These databases usually provide a large number of paper resources, which can be filtered according to keywords, authors, publication years and so on.
3. Read the abstract: Read the abstract before downloading the full text. Usually summarize the main contents and conclusions of a paper, which will help you to judge whether this paper is relevant to your research.
4. Check the citations: Checking the citations of papers can help you find more related papers. At the same time, if a paper is heavily cited by other papers, then this paper may be very important.
5. Evaluate the quality of the paper: Looking at the author, publishing organization, published periodicals and other information can help you evaluate the quality of the paper. Generally speaking, the papers published by famous scholars and authoritative journals are of high quality.
6. Consider language factors: If your English level is limited, it may be more difficult to choose papers written in languages other than English. However, some databases provide translated versions of papers, or you can seek professional translation help.
7. Keep up-to-date: Scientific research is a constantly developing field, so try to choose the latest papers. However, it should also be noted that some classic and basic papers are also worth reading.