To search the library catalog for different language materials, you can use the language filter on the Advanced Search page of OneSearch.
From the library's home page, get to Advanced Search by clicking the OneSearch button of the search bar.
Go to the Advanced Search by selecting the option in the main search bar.
Advanced search will open as a pop-up window. Scroll down to use the language filter on the bottom left of the pop-up window. From there you can simply search everything in that language, or use keywords and other filters to get the type of materials you are looking for.