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Here are some useful subject terms Worldcat UMD uses for pedagogy:
"Instruction and study"
"Studies and exercises"
You can combine any of these with your chosen instrument or instrument family (like "bowed stringed instruments" for more general resources).
Worldcat UMD and other library catalogs can be very picky about terminology. For example, you must use violoncello and double bass instead of cello and bass.
Helpful Subject Headings
Subject headings allow you to search and browse through different genres and types of music. Here is a list of some subject headings in Worldcat UMD that you might find helpful:
Instrument -- Instruction and study
Instrument -- Methods
Instrument -- Studies and exercises
Instrument -- Bibliography
To start searching just replace the subject headings above with your instrument of choice. Use "woodwind instruments" in place of a specific instrument for general woodwind instrument materials. "Woodwind quintets" or other common ensembles can also replace a specific instrument to find various instrumental ensemble materials.