Google-search – Syntax to for phrase match whilst excluding domains for search results

documentation

allintext: Google search

you can combine this with allintitle: -Google search

If I understand your question correctly, this can be achieved using quotes and wildcards. So something along the lines of searching "http://*keyword*.*" for a domain or "http://*keyword*.example.com" for a sub-domain of example.com.

You could simply use "http://*keyword*" to get as comprehensive results as possible.

(For completeness' sake, you must include the quotation marks, they limit it to "exactly this phase" while the asterisks can represent a character or number of characters.)

Hope that helps.