Perhaps you should try some spelling variations:
man machine » human machine, a machine, ai machine
machine 2.1 » machines 2.1, machine 2.6, machines 2.2
des human » does human, das human, des humains
ya human » a human, das human, 2 human
2.1 kind » 2.1 wind, 3.1 kinds, 4.1 kinds
kind siu » kind ein, kong siu
3 human » 2 human
sin » sign, sind, skin

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong di) or (dong sin)) ((((ya human) or (3 human))) or (des human)) man machine 2.1 kind siu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong di) OR (dong sin)) ((((ya human) OR (3 human))) OR (des human)) man machine 2.1 kind siu ;.
• Adding a wildcard symbol may retrieve word variants: ((dong di) or (dong sin)) ((((ya human) or (3 human))) or (des human)) man machine 2.1 kind siu ;*.