Perhaps you should try some spelling variations:
human task » human tasks, human back, human case
dong nan » dong yang, dong sin, dong bin
yong yue » wong yue, yang yue, young yun
dong di » dong sin
human a » human ai, human _, human 3
human e » human _, human eye, human co
ya a » a a, y a, ye a

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong nan) or (dong di)) ya a best ((human task) or (((human a) OR (human e)))) yong yue ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong nan) OR (dong di)) ya a best ((human task) OR (((human a) OR (human e)))) yong yue ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong nan) or (dong di)) ya a best ((human task) or (((human a) OR (human e)))) yong yue ;".
• Adding a wildcard symbol may retrieve word variants: ((dong nan) or (dong di)) ya a best ((human task) or (((human a) OR (human e)))) yong yue ;*.