Perhaps you should try some spelling variations:
past bias » cost bias, past has, past its
bias when » bars when
yang yang » wang yang, wang yan
when wei » when we, zhen wei, chen wei
wei shen » kwei sheng, enwei shen, wei shang
yang jie » yang jin, yang xi, yang yi
yang jui » yang judy, yang xi, yang yi
haji » hadi

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: past bias when wei shen ((((((yang yang) OR (yang jie))) OR (yang jui))) OR (yang di)) dato haji ;~.
• Adding a wildcard symbol may retrieve word variants: past bias when wei shen ((((((yang yang) or (yang jie))) or (yang jui))) or (yang di)) dato haji ;*.