Perhaps you should try some spelling variations:
asi series » psi series, basic series, anti series
ii series » iii series, ii services, mini series
2c series » 2 series, 21 series, 22 series
i series » i serious
c series » c serious, c server

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: %22nato ((asi series) OR (((ii series) OR (i series))))%((2c series) OR (c series)) 3%a high technology%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22nato ((asi series) or (((ii series) OR (i series))))%((2c series) or (c series)) 3%a high technology%22".
• Adding a wildcard symbol may retrieve word variants: %22nato ((asi series) or (((ii series) OR (i series))))%((2c series) or (c series)) 3%a high technology%22*.