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+Messages are searched through the obvious [`SearchRequest`](https://lonamiwebs.github.io/Telethon/methods/messages/search.html), but you may run into [issues](https://github.com/LonamiWebs/Telethon/issues/215). A valid example would be:
+```python
+result = client(SearchRequest(
+    entity, 'query', InputMessagesFilterEmpty(), None, None, 0, 0, 100
+))
+```
+
+It's important to note that the optional parameter `from_id` has been left omitted and thus defaults to `None`. Changing it to [`InputUserEmpty`](https://lonamiwebs.github.io/Telethon/constructors/input_user_empty.html), as one could think to specify "no user", won't work because this parameter is a flag, and it being unspecified has a different meaning.
+
+If one were to set `from_id=InputUserEmpty()`, it would filter messages from "empty" senders, which would likely match no users.
+
+If you get a `ChatAdminRequiredError` on a channel, it's probably because you tried setting the `from_id` filter, and as the error says, you can't do that. Leave it set to `None` and it should work.
+
+As with every method, make sure you use the right ID/hash combination for your `InputUser` or `InputChat`, or you'll likely run into errors like `UserIdInvalidError`.
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