For تركيب to cause منع صرف in this lesson:
- the expression is a proper name;
- two words have fused into that one name;
- it is not an incomplete compound such as idafah;
- it is not merely a sentence.
Thus حَضْرَمَوْتُ and مَعْدِيْكَرِبُ qualify, while عَبْدُ اللَّهِ and جَاءَ زَيْدٌ do not qualify through this cause.