Perhaps you should try some spelling variations:
"chemical measurements" » "physical measurements", "mechanical measurements", "optical measurements"
"physical measurement" » "physical measurements", "optical measurement", "clinical measurement"
"medical measurements" » "optical measurements", "physical measurements", "optical measurement"

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