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 khach quoc." (Expand Search), "nguyen han quoc." (Expand Search), "nguyen mai quoc." (Expand Search)
"nguyen khai luoc." » "nguyen khac luoc." (Expand Search), "nguyen hai luoc." (Expand Search), "nguyen khanh luoc." (Expand Search), "nguyen hai huoc." (Expand Search), "nguyen khai luan." (Expand Search)
"nguyen nhap quoc." » "nguyen nhat quoc." (Expand Search), "nguyen nhan quoc." (Expand Search), "nguyen nha quoc." (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 khai quoc.") OR ("nguyen nhap quoc."))) OR ("nguyen khai luoc."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nguyen khai quoc.\") OR (\"nguyen nhap quoc.\"))) OR (\"nguyen khai luoc.\"))".
• Removing quotes may allow a broader search: (((( nguyen khai quoc. ) OR ( nguyen nhap quoc. ))) OR ( nguyen khai luoc. )).
• Adding a wildcard symbol may retrieve word variants: (((("nguyen khai quoc.") OR ("nguyen nhap quoc."))) OR ("nguyen khai luoc."))*.