According to Bitbucket Cloud's documentation, it's not possible to search for the following characters in code search:
We strip the following characters from search terms: !"#$%&'()+,/;:<=>?@[]^`

~-*
https://confluence.atlassian.com/bitbucket/search-873876782.html

Request is for the ability to search on code fragment including hyphen '-' e.g. foo-bar, because otherwise too many search results are returned matching foo and bar without the hyphen