Some observations -
You appear to have five segments in Asia (the first one and the last four) - you're only allowed four (only two of which can be stopovers).
To reduce asian segments,
HKG-DEL-NRT-CGK
is an alternative route, but no F for these flights.
However, HKG-DEL-NRT-CGK is about 2,000 miles longer than HKG-BOM-BKK-HKG-CGK.