Perhaps you should try some spelling variations:
"ttissues engineering" » "tissues engineering", "_ tissueengineering", "tissue reengineering"
"issue engineering" » "tissues engineering", "tissue engeneering", "tissue reengineering"
"tissue engineering" » "ttissues engineering", "ttissue engeneering", "ttissue reengineering"

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