Perhaps you should try some spelling variations:
thinking john » thinking can, thinking form, thinking four
yang zwang » yang yang, yan wang, yang guang
sales case » sales call, cases case, sales past
wang yang » wang yan, wang liang, wang yanling
als case » als care, goals case, aids case
bonn ein » bonn mein, bonn die, kann ein

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 yang zwang ((als case) OR (sales case)) thinking john ((bonn ein) OR (song (shin OR sein))) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang zwang ((als case) or (sales case)) thinking john ((bonn ein) or (song (shin OR sein))) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yang zwang ((als case) or (sales case)) thinking john ((bonn ein) or (song (shin OR sein))) ;*.