Perhaps you should try some spelling variations:
peace research » science research
research nejm » research new, research need, research needs
central peace » central place, central places, centred peace
research firm » research from, research field, research final
s.a research » sla research, asia research, 2.1 research
central s.a » central asia, central asian, central state
firm series » film series, forum series, from series

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( central s.a research nejm series. ) or ( central peace research firm series. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( central s.a research nejm series. ) OR ( central peace research firm series. )).
• Adding a wildcard symbol may retrieve word variants: (( central s.a research nejm series. ) or ( central peace research firm series. ))*.