China use the syllable aggregations in their catalogs.
Chinese library users in China may not even need to use pinyin as search term to find the Chinese books in their libraries. Nobody is going to challenge you. Even worse, long titles in Classical Chinese. We also need to point out here that the word search fuction, which is one of the most useful tools for searching other language materials, becomes near useless when we don't aggregate. We don't see any punctuation marks in Chinese books published in the last century either.