These are search engines which will search for research datasets which have been published. Of the list, only Elsevier DataSearch will find data that has been published as supplementary material. Just as with general internet search engines, there is not one which will find all the datasets so you may have to search across multiple sources.
If you are accessing MarketLine off campus, you will need to click 'Shibboleth' on the sign in page and then select Swansea University as your institution.
If you are accessing Mintel off campus, you will need to click 'Federated login' on the sign in page and then select Swansea University as your institution.