của riêng họ 
of their own [ của ] : (1) (possessive marker), of; (2) property, possessions, belonging; (3) belong to
[ riêng ] : alone, only, separate, particular, private, personal, independent; as for
[ họ ] : (1) family, clan; (2) they
Most Common Compounds Set 1:
Most Common Compounds Set 2 :