Hi Bill
Easiest way to eliminate the Google "help" search prompts is to install 3rd party freeware
Glims. Latest version build is
available here.
Once installed you'll find Glims as a separate panel in your Safari Preferences. If it doesn't appear in the panel list, click on the right pointing arrows at the end of the Preference Panels.
Glims provides a number of very useful features for Safari. Specific to your needs, go to Glims' search suggestions sub-panel. There, you can deselect the "auto complete phrase in the search field". Additionally, Glims provides a very helpful search drop down panel for quick access to searches.
There's more to discover with Glims. Clicking on the various sub-panels will reveal other features, including specific search engine options.
Let me know if you have any other questions.