Perhaps you should try some spelling variations:
electrochemistry periodicals » geochemistry periodicals, histochemistry periodicals, biochemistry periodicals
spectrometry periodicals » spectroscopy periodicals, geometry periodicals, biometry periodicals
optometry periodicals » biometry periodicals, poetry periodicals, poultry periodicals
mass » maps

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

• Performing a fuzzy search may retrieve terms with similar spellings: mass ((((spectrometry periodicals) OR (electrochemistry periodicals))) or (optometry periodicals)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: mass ((((spectrometry periodicals) OR (electrochemistry periodicals))) OR (optometry periodicals))..
• The words AND, OR and NOT may confuse the search; try adding quotes: "mass ((((spectrometry periodicals) OR (electrochemistry periodicals))) or (optometry periodicals)).".
• Adding a wildcard symbol may retrieve word variants: mass ((((spectrometry periodicals) OR (electrochemistry periodicals))) or (optometry periodicals)).*.