To quickly locate a particular type of primary source in most online catalogues use the following terms as SUBJECT rather than KEYWORD terms:
For example, to find primary sources on women in China go to the OneSearch Advanced Search page, choose "Library Catalog" at the top and then enter your keywords ("women" and "China" and "sources" - making sure to change the ANY FIELD to SUBJECT for the line "sources":
Subject entries for countries and regions are usually subdivided by century. If you are looking for what is available to document general social or intellectual trends in a period search for the country's formal name (Great Britain, not "England") followed by the century designation: Great Britain 15th century. Major events in any century will often have a subheading of their own: Great Britain World War 1914 - 1918.
You can use the subheading Sources with these time period designations as well: Hundred Years War 1339 1453 Sources
When searching in WorldCat your result list will have a set of tabs at the top, two may be of interest for primary sources: