Perhaps you should try some spelling variations:
"sol-novel techniques" » "soll-novel techniques", "soul-novel techniques", "solo-novel techniques"
"sol-formal techniques" » "soll-formal techniques", "soul-formal techniques", "solo-formal techniques"
"sold-formal techniques" » "solld-formal techniques", "sould-formal techniques", "solod-formal techniques"

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: (("sol-novel techniques") OR ((((("sol-formal techniques") OR ("soil-formal techniques"))) OR ("sold-formal techniques")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"sol-novel techniques\") or (((((\"sol-formal techniques\") OR (\"soil-formal techniques\"))) or (\"sold-formal techniques\"))))".
• Removing quotes may allow a broader search: (( sol-novel techniques ) or ((((( sol-formal techniques ) OR ( soil-formal techniques ))) or ( sold-formal techniques )))).
• Adding a wildcard symbol may retrieve word variants: (("sol-novel techniques") or ((((("sol-formal techniques") OR ("soil-formal techniques"))) or ("sold-formal techniques"))))*.