Perhaps you should try some spelling variations:
"nguyen phuc luong." » "nguyen huu luong." (Expand Search), "nguyen huy luong." (Expand Search), "nguyen phan luong." (Expand Search), "nguyen phu luong." (Expand Search), "nguyen phuc long." (Expand Search), "nguyen phuc phuong." (Expand Search)
"nguyen duc long." » "nguyen huu long." (Expand Search), "nguyen huy long." (Expand Search), "nguyen duc luong." (Expand Search), "nguyen duc dong." (Expand Search), "nguyen duc cong." (Expand Search)
"nguyen khac long." » "nguyen khac luong." (Expand Search), "nguyen khac song." (Expand Search), "nguyen khac xuong." (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 phuc luong.") OR ((("nguyen duc long.") OR ("nguyen khac long."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nguyen phuc luong.\") OR (((\"nguyen duc long.\") OR (\"nguyen khac long.\"))))".
• Removing quotes may allow a broader search: (( nguyen phuc luong. ) OR ((( nguyen duc long. ) OR ( nguyen khac long. )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen phuc luong.") OR ((("nguyen duc long.") OR ("nguyen khac long."))))*.