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COMPOUNDS
hoàn toàn khác biệt nhau 
to be completely different
hoàn toàn khác hẳn completely different
hoàn toàn khác nhau completely different
khác hẳn completely different
hoàn toàn khác biệt nhau to be completely different hoàn toàn khác hẳn completely different hoàn toàn khác nhau completely different khác hẳn completely different