Perhaps you should try some spelling variations:
"tissues engineering" » "tissue engineering", "tissue bioengineering", "tissue engineered"
"tissue engeneering" » "tissue engineering", "tissue bioengineering", "_ tissueengineering"
"issue engineering" » "tissue engineering", "tissue reengineering", "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 ((("tissues engineering") OR ("tissue engeneering")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"issue engineering\") or (((\"tissues engineering\") OR (\"tissue engeneering\"))))".
• Removing quotes may allow a broader search: (( issue engineering ) or ((( tissues engineering ) OR ( tissue engeneering )))).
• Adding a wildcard symbol may retrieve word variants: (("issue engineering") or ((("tissues engineering") OR ("tissue engeneering"))))*.