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What's the difference between Japanese Amazon title search and keyword search?
Keywords are natural languages extracted from titles and abstracts. According to the content of the paper, the subject words are standardized languages. For multiple words representing the same concept, generally only one standardized word is selected as the subject word.

But nowadays, the subject retrieval in many databases refers to the retrieval according to the document content, which generally includes content-related fields such as title, abstract, subject words and keywords.