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

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 ("physical measurements")).
• Removing quotes may allow a broader search: (((( physical measurement ) or ( chemical measurements ))) or ( physical measurements )).
• Adding a wildcard symbol may retrieve word variants: (((("physical measurement") or ("chemical measurements"))) or ("physical measurements"))*.