Perhaps you should try some spelling variations:
reflecting gender » affecting gender, detecting gender, recasting gender
commercial codes » commercial code, commercial courts, commercial crimes
placed based » place based, land based, plant based
based based » based case, based backend
bed based » bdd based, need based, cfd based

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

• Performing a fuzzy search may retrieve terms with similar spellings: commercial codes ((((based based) OR (placed based))) or (bed based)) reflecting gender studies.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: commercial codes ((((based based) OR (placed based))) OR (bed based)) reflecting gender studies.*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "commercial codes ((((based based) OR (placed based))) or (bed based)) reflecting gender studies.*".