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 dinh." (Expand Search), "nguyen nguyen minh." (Expand Search)
"nguyen nguyen thanh." » "huyen nguyen thanh." (Expand Search), "ngan nguyen thanh." (Expand Search), "nguyen quyet thanh." (Expand Search), "nguyen nguyen thi." (Expand Search)
"nguyen khuyen anh." » "nguyen huy anh." (Expand Search), "nguyen thuy anh." (Expand Search), "nguyen hien anh." (Expand Search), "nguyen khuyen danh." (Expand Search), "nguyen huyen anh." (Expand Search), "nguyen thuyen anh." (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 thanh."))) OR ("nguyen khuyen anh."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nguyen nguyen anh.\") OR (\"nguyen nguyen thanh.\"))) OR (\"nguyen khuyen anh.\"))".
• Removing quotes may allow a broader search: (((( nguyen nguyen anh. ) OR ( nguyen nguyen thanh. ))) OR ( nguyen khuyen anh. )).
• Adding a wildcard symbol may retrieve word variants: (((("nguyen nguyen anh.") OR ("nguyen nguyen thanh."))) OR ("nguyen khuyen anh."))*.