Perhaps you should try some spelling variations:
vice » voice
rice » price, rise, rich
vie » viet, viec, view
vien » vietn, viecn, viewn, viet, bien
vietnam" » viettnam", viectnam", viewtnam"
vietnams" » viettnams", viectnams", viewtnams", vietnamese", vienam"
viettnam" » vietttnam", viecttnam", viewttnam", vienam"
resident » residents, president, resilient

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

• Performing a fuzzy search may retrieve terms with similar spellings: "(((vice or mice) or rice) or (vie or vien)) resident of ((vietnam" or vietnams") or viettnam")~.
• If you are trying to use Boolean operators, they must be ALL CAPS: "(((vice or mice) or rice) or (vie or vien)) resident of ((vietnam" OR vietnams") or viettnam").
• Removing quotes may allow a broader search: (((vice or mice) or rice) or (vie or vien)) resident of ((vietnam or vietnams ) or viettnam ).
• Adding a wildcard symbol may retrieve word variants: "(((vice or mice) or rice) or (vie or vien)) resident of ((vietnam" or vietnams") or viettnam")*.