Perhaps you should try some spelling variations:
"nguyen khai quoc." » "nguyen khac quoc." (Expand Search), "nguyen hai quoc." (Expand Search), "nguyen khanh quoc." (Expand Search), "nguyen khai luoc." (Expand Search), "nguyen khach quoc." (Expand Search), "nguyen han quoc." (Expand Search)
"nguyen nhap quoc." » "nguyen nhat quoc." (Expand Search), "nguyen nha quoc." (Expand Search), "nguyen nhuan quoc." (Expand Search)
"nguyen nhan quoc." » "nguyen phan quoc." (Expand Search), "nguyen nhat quoc." (Expand Search), "nguyen thanh quoc." (Expand Search), "nguyen han quoc." (Expand Search), "nguyen chuan quoc." (Expand Search)

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

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