Perhaps you should try some spelling variations:
programming designation » programming designing, programming negation, programming discrimination
introduction concepts » introductory concepts
programming recursion » programming decision, programming session, programming decisions
basic struts » basic truth, basic strokes, basic study

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

• Performing a fuzzy search may retrieve terms with similar spellings: introduction concepts ((programming designation) or (programming recursion)) basic struts~.
• If you are trying to use Boolean operators, they must be ALL CAPS: introduction concepts ((programming designation) OR (programming recursion)) basic struts.
• Adding a wildcard symbol may retrieve word variants: introduction concepts ((programming designation) or (programming recursion)) basic struts*.