Perhaps you should try some spelling variations:
"earthscan expert series." » "earthscan forest series.", "earthscan express series.", "earthscan report series.", "earthscan expert users."
"earthscan expert survey." » "earthscan forest survey."
"earthscan export service." » "earthscan export services.", "earthscan exports services.", "earthscan airport service."

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: (((("earthscan expert series.") OR ("earthscan expert survey."))) or ("earthscan export service."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("earthscan expert series.") OR ("earthscan expert survey."))) OR ("earthscan export service.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"earthscan expert series.\") OR (\"earthscan expert survey.\"))) or (\"earthscan export service.\"))".
• Removing quotes may allow a broader search: (((( earthscan expert series. ) OR ( earthscan expert survey. ))) or ( earthscan export service. )).
• Adding a wildcard symbol may retrieve word variants: (((("earthscan expert series.") OR ("earthscan expert survey."))) or ("earthscan export service."))*.