China HowNet, Wanfang Database, National Library Full-text Doctoral Dissertation Database, ERIC Database, Google Academic and International Dissertation Index.

Knowledge expansion:

First, China Knowledge Network (CNKI):

China HowNet is one of the largest academic databases in China, which contains a wealth of dissertations. These include not only the dissertations of Chinese universities, but also a large number of academic journals, conference papers and research reports. Researchers can obtain Chinese academic documents, search documents and download full-text dissertations through China HowNet.

2.Proquest Dissertation (PQDT):

ProQuest is an internationally renowned academic database provider, and its dissertation database PQDT contains master's and doctoral dissertations from all over the world. These papers cover a wide range of disciplines and provide full-text retrieval and download services, so that researchers can fully understand the international academic research trends.

Third, Google Academic:

Google Academic is a powerful academic search engine, which can be used to search various academic documents, including dissertations. Researchers can use Google academic search keywords to find related dissertations and find links or full texts of documents.

Four. International paper index:

This is a collection of some international dissertations databases, including dissertations resources from all over the world. Researchers can use these indexes to find and obtain academic research results around the world.

In a word, dissertations are important academic research achievements, and researchers can use various academic databases to retrieve and obtain these dissertations to support their research work and academic exploration. Different databases provide dissertations in different fields and regions, and researchers can choose the appropriate database to search according to their own needs.