Perhaps you should try some spelling variations:
thinking john » thinking can, thinking form, thinking home
thinking four » thinking form, thinking about, thinking aloud
zwang sales » zwang als
yang zwang » yang yang, yan wang, yang guang
sales case » sales call, cases case, sales past
wang yang » wang yan, wang liang, wang yanling
song sein » song shin, song jin, song min
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 sales case ((thinking john) OR (thinking four)) ((bonn ein) OR (song sein)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang zwang sales case ((thinking john) or (thinking four)) ((bonn ein) or (song sein)) ;*.