You ran a search and got an empty list. The query is usually at fault rather than the parser: Telegram search is simpler than people assume.
It matches names, not content
Telegram compares your query against channel names and usernames — not against post text. So «where to buy running shoes» finds nothing and «running shoes» finds plenty. Queries must look like the words people name channels with.
The query is too long
A four-word phrase is close to guaranteed zero: no channel is named that. One or two words work.
Filters removed everything
A thousand-subscriber minimum cuts most topical chats — live discussions are often small. Drop the filter and see whether anything appears.
Language
Search does not translate. An English word returns English-language channels and vice versa. If the niche has an English name in your market — crypto, dropshipping — search both.
What to do
Start with one broad word from your topic and no filters, and see what comes back. Then narrow. Compound spellings sometimes return results where spaced ones do not: channel names rarely use spaces. Collecting a large list across several runs is covered on the parser page.