Perhaps you should try some spelling variations:
"lecture notes in reproduction engineering" » "lecture notes in production engineering", "lecture notes in reproduction bioengineering", "lecture notes in reduction engineering"
"lecture notes in introduction engineering" » "lecture notes in production engineering", "lecture notes in introduction entering", "lecture notes in information engineering"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"lecture notes in reproduction engineering\") OR (\"lecture notes in introduction engineering\"))".
• Removing quotes may allow a broader search: (( lecture notes in reproduction engineering ) OR ( lecture notes in introduction engineering )).
• Adding a wildcard symbol may retrieve word variants: (("lecture notes in reproduction engineering") OR ("lecture notes in introduction engineering"))*.