Perhaps you should try some spelling variations:
when learning » open learning, between learning
learning jin » learning john, learning using, learning being
pioneer days » pioneering days, pioneer years, longer days
jin pioneer » rice pioneer
huang ying » huang jing, huang ting, huang yang
yang july » yang judy, yang jui, yang jun
wai yan » wang yan, wei yang
yang xi » yang di, yang yi, yang jui

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: ((wai yan) OR (huang ying)) ((yang xi) OR (yang july)) when learning jin pioneer days ;~.
• Adding a wildcard symbol may retrieve word variants: ((wai yan) or (huang ying)) ((yang xi) or (yang july)) when learning jin pioneer days ;*.