If you have a partial name or link, you can try typing t.me/ followed by the channel name in your mobile browser's address bar (e.g., t.me/_bh2 or t.me/_Sidezip ). :
Look under the section. If the channel is public, it will appear here. Using Invite Links : _bh2 Search Telegram Channel _Sidezip
Open Telegram and tap the icon (magnifying glass) at the top of your chat list. If you have a partial name or link, you can try typing t