like: die Beziehung → →
die Beziehung ☊ 
mối quan hệ ☊ 
☊ Relations between them have definitely cooled (= they are not as friendly with each other as they were). ☊ cool ☊
the relationship between mother and baby ☊ mother ☊
relation (with sb/sth): Relations with neighbouring countries are under strain at present. ☊ relation ☊
relation (between A and B): We seek to improve relations between our two countries. ☊ relation ☊
relationship (between A and B): The relationship between the police and the local community has improved. ☊ relationship ☊
relationship (between A and B): the relationship between mental and physical health ☊ relationship ☊
relationship between A and B: I'm not sure of the exact relationship between them—I think they're cousins. ☊ relationship ☊
There are strains in the relationship between the two countries. ☊ strain ☊
The relationship started to go wrong when they moved abroad. ☊ go wrong ☊