Extended retrieval is a pinyin retrieval and related retrieval function. If the system supports extended retrieval, users can input pinyin retrieval, and at most, the top seven words with the highest relevance to keywords are displayed at the bottom of the retrieval results page. Click "More Related Search" to browse all related words, and sort them according to their relevance from high to low.
In other words, extended retrieval is an extension of retrieval, which can be extended and related retrieval according to subject dictionaries, including automatic extended retrieval of subject dictionaries, automatic extended retrieval of synonyms/antonyms, and automatic extended retrieval of all angles.