Perhaps you should try some spelling variations:
"nato psi series, series 1: applied sciences" » "nato i series, series 1: applied sciences", "nato ii series, series 1: applied sciences", "nato iii series, series 1: applied sciences", "nato asi series, series 1: applied sciences", "nato ari series, series 1: applied sciences", "nato psi series, series 2: applied sciences"
"nato psi series, series 3: applied sciences" » "nato i series, series 3: applied sciences", "nato ii series, series 3: applied sciences", "nato iii series, series 3: applied sciences", "nato asi series, series 3: applied sciences", "nato ari series, series 3: applied sciences"
"nato im series, series 1: applied science" » "nato m series, series 1: applied science", "nato am series, series 1: applied science", "nato fm series, series 1: applied science", "nato im series, series 2: applied science"

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: (((("nato psi series, series 1: applied sciences") OR ("nato psi series, series 3: applied sciences"))) OR ("nato im series, series 1: applied science")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato psi series, series 1: applied sciences\") OR (\"nato psi series, series 3: applied sciences\"))) or (\"nato im series, series 1: applied science\"))".
• Removing quotes may allow a broader search: (((( nato psi series, series 1: applied sciences ) OR ( nato psi series, series 3: applied sciences ))) or ( nato im series, series 1: applied science )).
• Adding a wildcard symbol may retrieve word variants: (((("nato psi series, series 1: applied sciences") OR ("nato psi series, series 3: applied sciences"))) or ("nato im series, series 1: applied science"))*.