How to create a bot to search and display messages from channels on demand?

Question

Search engines

Greetings dear ones. Maybe someone can share their experience in creating a bot with such functionality as. on a certain request, the bot displays all messages from the channels specified in advance in which this request occurs.
That is, if you write the request "Car", the bot will give us all the messages from our 10 channels, for example, to which we indicated to him in advance. Where does this word occur.

Answer 1

1) a search engine
bot 2) you connect a client bot to relay channels
, only the frequency of requests (2) will be limited, it is better to keep where you will contact (1)

Answer 2

I have no experience, but I can say that for the task of searching for messages, you will have to use not the Bot API, but do something based on some client library for Telegram.