Perhaps you should try some spelling variations:
"world health networking paper" » "world health networking player", "world health networking peer", "world health networking power", "child health networking paper"
"world health working paper" » "world healthy working paper", "world health warning paper", "world health workers paper", "child health working paper"

Try widening your search to All Fields.

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world health working paper\") OR (\"world health networking paper\"))".
• Removing quotes may allow a broader search: (( world health working paper ) OR ( world health networking paper )).
• Adding a wildcard symbol may retrieve word variants: (("world health working paper") OR ("world health networking paper"))*.