Perhaps you should try some spelling variations:
vice » voice
rice » price, rise, rich
vie » viet, vien, view
viec » vietc, vienc, viewc, viet, vien
viectnam" » vietctnam", vienctnam", viewctnam", viettnam", vientnam", vietnam", vienam", vietnams"
vietttnam" » viettttnam", vientttnam", viewtttnam", vietnam"
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 viec)) resident of (viectnam" or vietttnam")~.
• If you are trying to use Boolean operators, they must be ALL CAPS: "(((vice OR mice) OR rice) OR (vie OR viec)) resident of (viectnam" or vietttnam").
• Removing quotes may allow a broader search: (((vice or mice) or rice) or (vie or viec)) resident of (viectnam or vietttnam ).
• Adding a wildcard symbol may retrieve word variants: "(((vice or mice) or rice) or (vie or viec)) resident of (viectnam" or vietttnam")*.