Perhaps you should try some spelling variations:
"underground workings" » "underground works", "underground openings", "underground mining"
"underground blasting" » "underground banking", "underground blast", "underground building"
"underground cabling" » "underground sampling", "underground tackling", "underground cable"
"underground parking" » "underground banking", "underground mining", "underground parts"

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