First you need to analyze the referer string, if not empty. This can be done in different ways.
Consider this Google-like string:
<p><a href="referer.cfm?q=become+a+business+coach&ie=utf-8&oe=utf-8">test</a></p>
Same referer.cfm should perform the check.
Say, simplest and totally not flexible way is to search through the referer:
<cfif cgi.HTTP_REFERER NEQ ""
AND FindNoCase("business", cgi.HTTP_REFERER)
AND FindNoCase("coach", cgi.HTTP_REFERER)>
<cflocation url="http://where.you.want.to.go.tld/" addtoken="false">
</cfif>
More advanced approach can be the search through the search query keywords. First you should split the string:
<cfif cgi.HTTP_REFERER NEQ "">
<!--- extract the search phrase --->
<cfloop list="#cgi.HTTP_REFERER#" delimiters="&" index="token">
<cfif FindNoCase("?q=", token)>
<cfset phrase = ListLast(token, "?q=") />
<!--- extract the keywords --->
<cfloop list="#phrase#" delimiters="+" index="keyword">
<!--- search needed keyword and perform relocation --->
</cfloop>
</cfif>
</cfloop>
</cfif>
How to search the keyword -- up to you, maybe query the database and search matches, maybe create configuration directly in code. In both ways I'd used set of structures like this example:
<cfset rule = StructNew() />
<cfset rule["keywords"] = "become,business,coach" />
<cfset rule["url"] = "http://where.you.want.to.go.tld/" />
When keywords match the search phrase, use url to relocate.