Perhaps you should try some spelling variations:
dong nana » dong nan, dong yang
nana yala » nana yaa
a regione » _ regione, a regional, 2 regionen
jiu congo » jiu cong, du congo, eic congo
congo shu » cong shu
a region » a regional
yan jiu » yang jie, yang jin, pang jiu

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

• Performing a fuzzy search may retrieve terms with similar spellings: dong nana yala ((a region) or (a regione)) yan jiu congo shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong nana yala ((a region) OR (a regione)) yan jiu congo shu ;.
• Adding a wildcard symbol may retrieve word variants: dong nana yala ((a region) or (a regione)) yan jiu congo shu ;*.