Perhaps you should try some spelling variations:
international contributions » international institutions, international construction, international communications
contributions a » contributions _, contribution _, contributions royal
a regression » _ regression, data regression
array string » array strong, arrays strings, array sharing
arrays brad » arrays load, arrays based
arrays ang » arrays a

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

• Performing a fuzzy search may retrieve terms with similar spellings: international contributions a regression ((((array string) or (arrays ang))) or (arrays brad))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: international contributions a regression ((((array string) OR (arrays ang))) OR (arrays brad)).
• Adding a wildcard symbol may retrieve word variants: international contributions a regression ((((array string) or (arrays ang))) or (arrays brad))*.