Narrow search gives more results

Narrow search gives more results

Hi,

I have question regarding the Zoho Mail search feature.

Suppose I need to search all emails from a specific email domain address, like "abcdefgh.com".

If my keyword search is abc, I have no results, but if I search for abcdefgh I get the desired results.

How can a more narrow search result more records than a more wide search?

Thank you,

Igor.