Factiva seems to find the most information from other countries in major news sources, in English and in the local language! The example below is full of nitty-gritty details that are of EXTREME importance, so look closely!
If I were searching for recent polling data on Polish public opinion on Covid and vaccinations as reported in English language sources in Poland, I would do the search described below. Note I selected REGION: POLAND and DATE in the last YEAR.
And below is the basic search statement. Copy it but replace the (covid* or vaccine*) section with words describing your topic of interest.
(public near4 opinion or opinion near4 poll*) AND wc>1000 AND (covid* or vaccine*)