Perhaps you should try some spelling variations:
"nguyen nguyen anh." » "huyen nguyen anh." (Expand Search), "ngan nguyen anh." (Expand Search), "nguyen quyet anh." (Expand Search), "nguyen nguyen thanh." (Expand Search), "nguyen nguyen dinh." (Expand Search)
"nguyen nguyen minh." » "huyen nguyen minh." (Expand Search), "ngan nguyen minh." (Expand Search), "nguyen quyet minh." (Expand Search), "nguyen nguyen dinh." (Expand Search)
"nguyen khuyen minh." » "nguyen huy minh." (Expand Search), "nguyen thuy minh." (Expand Search), "nguyen hien minh." (Expand Search), "nguyen huyen minh." (Expand Search), "nguyen khuyen sinh." (Expand Search), "nguyen thuyet minh." (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("nguyen nguyen anh.") OR ((("nguyen nguyen minh.") OR ("nguyen khuyen minh."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nguyen nguyen anh.\") OR (((\"nguyen nguyen minh.\") OR (\"nguyen khuyen minh.\"))))".
• Removing quotes may allow a broader search: (( nguyen nguyen anh. ) OR ((( nguyen nguyen minh. ) OR ( nguyen khuyen minh. )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen nguyen anh.") OR ((("nguyen nguyen minh.") OR ("nguyen khuyen minh."))))*.