Perhaps you should try some spelling variations:
"trade weather services" » "trade water services", "bad weather services", "space weather services", "trade further services"
"formal sector sources" » "formal sector resources", "formal sector resource", "formal sector shares", "informal sector sources", "informal sectors sources", "social sector sources"
"formal sector survey" » "informal sector survey", "informal sectors survey", "social sector survey"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("trade weather services") or ((("formal sector sources") OR ("formal sector survey"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("trade weather services") OR ((("formal sector sources") OR ("formal sector survey")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"trade weather services\") or (((\"formal sector sources\") OR (\"formal sector survey\"))))".
• Removing quotes may allow a broader search: (( trade weather services ) or ((( formal sector sources ) OR ( formal sector survey )))).
• Adding a wildcard symbol may retrieve word variants: (("trade weather services") or ((("formal sector sources") OR ("formal sector survey"))))*.