Perhaps you should try some spelling variations:
rise » risk
vie » vien, viec, view
viet » vient, viect, viewt
viennt » viennnt, viecnnt, viewnnt
viectnam" » vienctnam", viecctnam", viewctnam", vietnam", vienam", vietnams"
vientnam" » vienntnam", viecntnam", viewntnam", 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: "(rise OR (vie OR (viet OR viennt))) (resident OR residents) of (viectnam" or vientnam")~.
• Removing quotes may allow a broader search: (rise or (vie or (viet or viennt))) (resident or residents) of (viectnam or vientnam )~.
• Adding a wildcard symbol may retrieve word variants: "(rise or (vie or (viet or viennt))) (resident or residents) of (viectnam" or vientnam")*.