To try to explain this sentence a bit more, the child is either too tired to go on doing something, (like in "I can't take it any more" or "I can't go on") or too full to eat any more. Unfortunately, there is no real English counterpart to this word, but it's a very important (and handy!) word, so we wanted to teach it anyway.
I wrote "The child is too tired", which I think without any further context is a reasonable translation, but it was marked wrong. Saying "the child cannot take any more" without any context sounds to me kind of like someone is abusing the child. I think this sentence will need a lot of different options for correct translations. I agree it's an important word to teach though!
I entered "the child doesn't have enough energy any more" and I was told the correct answer was "The child can not eat any more" and I am confused about where the concept of eating came from. Although this page says the correct translation is something else. How strange.
This is maddeningly difficult to guess what version of "The child cannot continue any more" (not accepted) "The child cannot do more" (not accepted), "The child does not have any more strength" etc is required. I have now memorized the exact sentence required but this does not feel like learning exactly.
It is disturbing to presume what your translation implies - that a child cannot take anymore. Take anymore of what? It feels onerous. Punishment? Perhaps (or maybe which should be an acceptable and interchangeable word) you should just eliminate using the word "orkar" altogether as it seems too problematic as is.