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

You may be able to get more results by adjusting your search query.

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