Perhaps you should try some spelling variations:
mathematics pieri's » mathematics paris, mathematics physics, mathematics pairing
mathematical series » mathematical services, mathematical stories, mathematical species
mathematics series » mathematics species, mathematics studies, mathematics service
etc financial » c financial, sec financial, plc financial
chapman » chaplain

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: chapman AND hall/etc financial ((((mathematics series) OR (mathematics pieri's))) OR (mathematical series)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "chapman and hall/etc financial ((((mathematics series) OR (mathematics pieri's))) or (mathematical series))".
• Adding a wildcard symbol may retrieve word variants: chapman and hall/etc financial ((((mathematics series) OR (mathematics pieri's))) or (mathematical series))*.