Making a long "connection" in SIN for KUL

[hybridace101]

Hello! I am planning a MNL-SIN-KUL-SIN-MNL on SIA in a few months' time. When I look at SIN-KUL flight separately from MNL-SIN, I get more options. However, when I combine them into multi-journey itinerary, my options become limited. For instance, when I try to book MNL-SIN for one day and SIN-KUL flights for the next day, the evening flights for the latter do not show up. They do show up if I look at each city pair separately. How come this is the case?

[SINFJ]

Hello! I am planning a MNL-SIN-KUL-SIN-MNL on SIA in a few months' time. When I look at SIN-KUL flight separately from MNL-SIN, I get more options. However, when I combine them into multi-journey itinerary, my options become limited. For instance, when I try to book MNL-SIN for one day and SIN-KUL flights for the next day, the evening flights for the latter do not show up. They do show up if I look at each city pair separately. How come this is the case?

Married segments or logical connections