How to Search Chat History by Keyword: First Determine Whether You're Searching a Single Chat, Globally, or Across All Accounts

WhatsApp, Telegram, and LINE each have their own entry points and filters for keyword search; this article provides step-by-step instructions for three scopes—searching one person, searching all conversations, and searching all accounts—explains how to choose keywords and use date and media filters, and offers practical workarounds for three situations where native search fails: cross-account, cross-language, and employee turnover.