Understanding those who do not understand

Correcting the dissertation, seminar and scientific papers of the Brothers for the past few days, I realise that quite a few of them spend time in the library or study hall, reading. Unfortunately what they read they do not understand. But that's not their real problem. Their real problem is that they 'think' - or are even convinced - that they understand! So when you ask them if they have read a particular article or class notes they all agree. You ask them if they have any clarifications or doubts, there will be none. But you go a step further and ask a couple of questions, just simple, straight and easy ones, you'll only draw a blank! Now to make a person who does not understand and knows that he has not understood is possible; but how does one help one understand something when he is convinced that he already and perfectly has!