Perhaps you should try some spelling variations:
"biochemical characterization" » "chemical characterization", "material characterization"
"mechanical characterization" » "chemical characterization", "material characterization"
"physical characterization" » "chemical characterization", "physical characteristics", "optical characterization"

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