It is fairly poetic but it can be understood. (Mien is not a very common word)
It means 'it's mine'.
Nothingness. Nothingness. Nothingness. Nothingness.
Nothingness. (Google Translator)
Perhaps you mean "Mein Lieber." That is a German phrase something like, "my dear fellow."
'In the hope that' is the correct phrase.
If you are referring to this sentence, no, it does not resemble a correct phrase AT ALL.
This is not a sentence it is a phrase and as a phrase it is correct.
Did they....?
That is the correct spelling of "phrase" (word group, or to use specific words).
Wang Mien was born in 1287.
Wang Mien died in 1359.
Mien Ruys died in 1999.