Perhaps you should try some spelling variations:
vice » voice
rice » price, rich
rise » risk
vie » viet, vien, view
viec » vietc, vienc, viewc, viet, vien
vienctnam » vietnctnam, viennctnam, viewnctnam, vietnam
viecttnam » vietcttnam, viencttnam, viewcttnam, vietttnam, vienttnam, 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 rise)) or (vie or viec)) resident of (vienctnam or viecttnam )~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((vice OR mice) OR (rice OR rise)) OR (vie OR viec)) resident of (vienctnam OR viecttnam ).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((vice or mice) or (rice OR rise)) or (vie or viec)) resident of (vienctnam or viecttnam )".
• Adding a wildcard symbol may retrieve word variants: (((vice or mice) or (rice OR rise)) or (vie or viec)) resident of (vienctnam or viecttnam )*.