Perhaps you should try some spelling variations:
learning risk » learning crisis, learning r, learning rate
iot learning » ict learning, shot learning, clt learning
risk coping » risk pooling
coping shu » cong shu
hua jiang » ru jiang, nu jiang
hua guang » wu guang
end iot » end note, end cost

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: ((lang OR wan) OR wing) ((hua guang) OR (hua jiang)) end iot learning risk coping shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((lang or wan) or wing) ((hua guang) or (hua jiang)) end iot learning risk coping shu ;*.