Just came back to say: the FB partner page for China Airlines lists the following exclusions:
*Note: The following flights are excluded for accrual and redemption:
* Amsterdam – Bangkok – Taipei (CI66)
* Taipei – Bangkok – Amsterdam (CI65)
* All Ferry & Training flights with flight numbers between 1000 - 1999
* All other flights with flight numbers between 4000 – 4999
* All Freighter flights with flight numbers between 5000 – 6999
* All charter flights with flight numbers between 7000 – 7999
So perhaps you should factor not receiving any Award/Level Miles or Qualifying Segments into your decision of whether to book on China Airlines. (To be honest, I am flabbergasted that they would not allow earning on these routes...)