Perhaps you should try some spelling variations:
specialist speciesical » specialist species
specialized protocols » specified protocols, specialized tools, specialized periodicals
speciesical returns » periodical returns, specific returns
special periodical » special pedagogical, serials periodicals, specialized periodicals
periodical reports » periodical returns, periodic report, periodical record
special protocols » special protocol, social protocols, serial protocols
specialist period » socialist period, special period, specialist species
period returns » periodical returns

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: (((( ((specialized protocols) OR (special protocols)) reports ) OR ( special periodical reports ))) OR ((( specialist speciesical returns ) OR ( specialist period returns )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( ((specialized protocols) OR (special protocols)) reports ) or ( special periodical reports ))) or ((( specialist speciesical returns ) or ( specialist period returns ))))".
• Adding a wildcard symbol may retrieve word variants: (((( ((specialized protocols) OR (special protocols)) reports ) or ( special periodical reports ))) or ((( specialist speciesical returns ) or ( specialist period returns ))))*.