Perhaps you should try some spelling variations:
hua patent » how patent, us patent
dong skin » dong sin, dof skin
dong sein » dong sin, dong wei, ong sean
mini cong » minh cong, mini cold
dong bin » dong sin, dong di, dann bin
a patent » a patient, _ patent, a parent
a mini » _ mini, a mining

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: ((((dong skin) OR (dong bin))) OR (dong sein)) ya ((hua patent) OR (a patent)) a mini cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((((dong skin) or (dong bin))) or (dong sein)) ya ((hua patent) or (a patent)) a mini cong shu ;*.