Generic titles are based on the form or type of composition. Examples are sonatas, preludes, & symphonies.
Distinctive titles are when the composer gives a work a title that is not based on the form or type of composition. Examples are Ungarische Tanze by Brahms,and Valse Romantique by Debussy
Be careful with nicknames! Some works have common names that are not actually distinctive titles. The Moonlight Sonata is actually Sonata no.14 in C sharp minor, op. 27 no. 2
If you're searching for a movement, try simply searching for the title of the larger work. Movement names are not always indexed in the library catalog.
If you're searching for a work that is part of a suite, also try searching for the suite title. For "Clair de Lune" by Debussy, also search for "Suite Bergamasque"
Search for the title in the original language. An example is Wohltemperierte Klavier not Well Tempered Clavier
Put quotation marks around the title "Wohltemperierte Klavier"
Use the name of the generic form in English. An example is "Sonata" not "Sonate"
Locate all serial numbers and composer's catalog numbers for your work. Don't just search "sonata no. 14" but also try "op. 27 no. 2"
Use the words "arranged piano" when searching for piano arrangements of instrumental works
Use the words "vocal score with piano" when searching for piano arrangements of vocal works