The answer is corroborate, but I feel like it should be “undermine”. I believe vain search is a -ve, so “undermines” works better. Vain search as in everything he found undermined his suggestion
Doesn’t really make sense that he’d look for evidence to undermine his suggestion
He’s more likely to look for evidence to support his suggestion
His search is in vain because he has gone through hundreds of articles without success (…in vain) but the presence of “the vain” doesn’t affect the choice of word here
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