Talvez debería tentar con algunhas variantes ortográficas:
introduction comprehension » introduction comprehensive, information comprehension, instruction comprehensive
programming tutorials » programming tutorial, programming theories, programming tools
programming trust » programming test, programming robust, programming tips
concepts care » concepts case, concepts cases, concepts karen

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: introduction comprehension ((programming tutorials) OR (programming trust)) concepts care~.
• Adding a wildcard symbol may retrieve word variants: introduction comprehension ((programming tutorials) or (programming trust)) concepts care*.