Perhaps you should try some spelling variations:
"tissue reengineering" » "tissue engineering", "tissue bioengineering", "tissues engineering"
"tissue engeneering" » "tissue engineering", "tissues engineering", "tissue bioengineering"
"issue engineering" » "tissue engineering", "tissues engineering", "missile engineering"

Try widening your search to All Fields.

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: (((("issue engineering") OR ("tissue reengineering"))) OR ("tissue engeneering")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"issue engineering\") OR (\"tissue reengineering\"))) or (\"tissue engeneering\"))".
• Removing quotes may allow a broader search: (((( issue engineering ) OR ( tissue reengineering ))) or ( tissue engeneering )).
• Adding a wildcard symbol may retrieve word variants: (((("issue engineering") OR ("tissue reengineering"))) or ("tissue engeneering"))*.