Please explain the difference between get ... away from ... and take ... away from ... .
For example: They get the children away from the TV. They take the rubbish away from the house.
when we use get away and when take away?
To get away from ... has several meanings (see Wiktionary), including "to move away from ...". Here's an example from Wiktionary:
Get away from the edge of the cliff!
In the phrase "get the children away from the TV", get is used as a transitive verb (i.e. it has an object: "the children"), whereas the Wiktionary example uses get in an intransitive manner. However, the meaning is similar. The idea is to move the children away from the television by making them do something else (e.g. play outside).
To take [something] away (from) is always used in a transitive manner; see the examples in Wiktionary. The first meaning is, "To remove something and put it in a different place." So the sentence "They take the rubbish away from the house" refers to rubbish removal.
Some examples of "take away":
When "take away" uses people as (grammatical) object, these people are usually moved elsewhere without their consent. "They took away the children" could mean "they [=some public authority] took the children into custody" or even "they kidnapped the children". See e.g.: