Perhaps you should try some spelling variations:
between challenges » between changes, twin challenges, burden challenges
seven challenges » level challenges, open challenges, design challenges
zhang wang » zhang fang, zhang zhang, zhang fan
kavil hong » kai hong
wang ya » wang yan, wang yang, wang hua
ya data » a data, 2a data, ea data

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

• Performing a fuzzy search may retrieve terms with similar spellings: zhang wang ya data ((between challenges) OR (seven challenges)) kavil hong seo ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "zhang wang ya data ((between challenges) OR (seven challenges)) kavil hong seo ;".
• Adding a wildcard symbol may retrieve word variants: zhang wang ya data ((between challenges) OR (seven challenges)) kavil hong seo ;*.