Perhaps you should try some spelling variations:
concurrent challenges » current challenges, concurrent changes, concerns challenges
challenges 15 » challenges 1.5, challenges 1, challenges 5
wang liang » wang yang
young hai » young choi, young man, young a
wong yue » wang yue, hong yu
15 young » 5 young, _ young, a young
lang di » yang di, wang di, klang die
yue 3 » vue 3, yue _

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: ((wang liang) OR (lang di))wong yue 3 concurrent challenges 15 young hai ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang liang) or (lang di))wong yue 3 concurrent challenges 15 young hai ;*.