Add quotation marks around phrases eg "extended basic"
In the results, note the extract for each link before clicking to see if it is relevant.
Google note: Google is now virtually unuseable with lots of page space totally irrelevant and "hidden" sponsored results. There seems to be less relevant and informative content by the day. If one of the links to Google gives you poor results, try Onesearch which is derived from Bing. (One search is my normal search engine these days). DuckDuckGo MAY improve on Google.