The phrase "trouble to understand" is correct and usable in written English.
You can use it when describing someone's difficulty in understanding a concept or idea. For example, "I'm having trouble understanding the new concept my professor taught."
But far too few take the trouble to understand what that is.
"It is important we take the trouble to understand" Afghan society.
If we took the trouble to understand the past, we might stop building our lives on top of sinkholes.
If we take the trouble to understand that rationality, we might have a better chance of figuring out what its adherents will do next and preventing it.
"Perhaps, if Senator Obama would take the time and trouble to understand this issue he would learn to debate an honest disagreement respectfully.
By that very logic, of course, they do not belong to a European who has not taken the trouble to understand and absorb them.
It isn't that von Trier is "anti-American" - that bogus charge against which he is defended by his saucer-eyed admirers - it is just that he wants to harness the power of American history and pop culture without troubling to understand them deeply.
According to Moser and Dunning ([1986]), the high level of protest bids reveals that some questions could be misunderstood; the respondents have troubles to understand the study scenario or are not convinced that the proposed project becomes real.
With regards to content one of the forward translators had troubles to understand the meaning of the predetermined different answers and scorings to question 8 ("If you have no pain while undertaking Achilles tendon loading sports, for how long can you train/practise?"): If someone would have no sport related Achilles tendon pain, (s)he will be able to train as long as (s)he likes.
He replied that when Albert Einstein had received a paper out of the blue from an unknown Indian, he'd taken the trouble to read it and understand it.
I worked on my peripheral vision, and learned to recognize when people are in trouble, and to understand what draws them to moshing, and how the band relates to it, and what security does in certain situations — all that stuff".
