If you actually include the quotes in your search term, you'll get the results you want, including zero results if there are no exact matches. Either of the following search terms will work:

"Error: 98yuasdvfnbi89yt7"

Error "98yuasdvfnbi89yt7"

In both cases, that search will currently return one page, this one.

https://www.google.com/search?q=Error+%2298yuasdvfnbi89yt7%2...

https://www.google.com/search?q=%22Error%3A+98yuasdvfnbi89yt...