perhaps you were trying something like this (change xpaths as follows, based on your needs):
notice here that the text node should be equal to 'Colombia':
//span[contains(@class, 'md_countryName_fdxiah8') and text()='Colombia']
or, the text node might contain some long text, but should also contain 'Colombia' in that text:
//span[contains(@class, 'md_countryName_fdxiah8') and contains(text(), 'Colombia')]
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