Duong is writing to a newspaper in England. He wants to find a pen friend.

Duong is writing to a newspaper in England in order to find a pen friend.

So as to find his friend in England, Duong has to write to a newspaper there.

Duong wants to find a pen friend, although he is writing to a newspaper in England.

Duong is writing to a newspaper in England and then he finds a pen friend.