Perhaps you should try some spelling variations:
main changes » main chance, main charge, main challenges
man changed » has changed, a changed, can change
china young » china ying, child young, china yang
young john » kong john, wong john, young jean
bonn shin » song shin, bonn mein
long han » long chain, long thanh, long haul
bonn ein » bonn mein, bonn die, kann ein

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

• Performing a fuzzy search may retrieve terms with similar spellings: long han ((man changed) OR (main changes)) china young john ((bonn shin) or (bonn ein)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: long han ((man changed) OR (main changes)) china young john ((bonn shin) OR (bonn ein)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "long han ((man changed) OR (main changes)) china young john ((bonn shin) or (bonn ein)) ;".
• Adding a wildcard symbol may retrieve word variants: long han ((man changed) OR (main changes)) china young john ((bonn shin) or (bonn ein)) ;*.