Perhaps you should try some spelling variations:
2.3.4 challenges » 2.3.2 challenges, 5.3.4 challenges, 2.3.1 challenges
3.4 challenges » 1.4 challenges, 2.4 challenges, 3.1 challenges
wang wang » wang yang, wang liang, wang yan
wang wei » zhang wei, wang zhi
asia ser » asia sub
shin » skin, sein, thin

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang wang wang wei ((3.4 challenges) or (2.3.4 challenges)) asia ser shin ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang wang wei ((3.4 challenges) OR (2.3.4 challenges)) asia ser shin ;*.