Perhaps you should try some spelling variations:
quantitative marketing » quantitative modeling, quantitative magnetic, quantitative easing
international serials » international serious, international trials, international materials
international aerien » international african, international aktiven, international action

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: ((international aerien) OR (international serials)) in ((quantitative marketing) OR (quantitative imaging)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((international aerien) or (international serials)) in ((quantitative marketing) OR (quantitative imaging))".
• Adding a wildcard symbol may retrieve word variants: ((international aerien) or (international serials)) in ((quantitative marketing) OR (quantitative imaging))*.