Perhaps you should try some spelling variations:
"underground blasting" » "underground banking", "underground blast", "underground building"
"underground workings" » "underground works", "underground openings", "underground mining"
"underground parking" » "underground banking", "underground mining", "underground openings"
"underground parts" » "underground gas", "underground press", "underground karst"

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: (("underground blasting") OR ((((("underground parking") OR ("underground parts"))) OR ("underground workings")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"underground blasting\") or (((((\"underground parking\") OR (\"underground parts\"))) or (\"underground workings\"))))".
• Removing quotes may allow a broader search: (( underground blasting ) or ((((( underground parking ) OR ( underground parts ))) or ( underground workings )))).
• Adding a wildcard symbol may retrieve word variants: (("underground blasting") or ((((("underground parking") OR ("underground parts"))) or ("underground workings"))))*.