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 ).
• Adding a wildcard symbol may retrieve word variants: (((vice or mice) or rice) or (vie or viec)) resident of (viectnam or vietttnam )*.