Perhaps you should try some spelling variations:
codesria yearbook » codesria book
"CODESRIA yearbook series" » "CODESRIA textbook series", "CODESRIA textbooks series"
codesria ebook » codesria book
"CODESRIA ebook series" » "CODESRIA book series", "CODESRIA textbook series", "CODESRIA bank series"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("CODESRIA ebook series") OR ("CODESRIA yearbook series"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"CODESRIA ebook series\") OR (\"CODESRIA yearbook series\"))".
• Removing quotes may allow a broader search: (( CODESRIA ebook series ) OR ( CODESRIA yearbook series )).
• Adding a wildcard symbol may retrieve word variants: (("CODESRIA ebook series") OR ("CODESRIA yearbook series"))*.