Perhaps you should try some spelling variations:
vie » viet, view
viec » vietc, viewc, viet
vien » vietn, viewn, viet, bien
viectnam" » vietctnam", viewctnam", viettnam", vietnam", vienam", vietnams"
vientnam" » vietntnam", viewntnam", viettnam", bientnam", vietnam", vienam", vietnams"
resident » president, resilient, residence
residents » presidents, resilients, residences

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

• If you are trying to use Boolean operators, they must be ALL CAPS: "(vie OR (viec OR vien)) (resident OR residents) of (viectnam" or vientnam")~.
• Removing quotes may allow a broader search: (vie or (viec or vien)) (resident or residents) of (viectnam or vientnam )~.
• Adding a wildcard symbol may retrieve word variants: "(vie or (viec or vien)) (resident or residents) of (viectnam" or vientnam")*.