Perhaps you should try some spelling variations:
"nguyen khanh quoc." » "nguyen thanh quoc." (Expand Search), "nguyen khac quoc." (Expand Search), "nguyen anh quoc." (Expand Search), "nguyen khach quoc." (Expand Search), "nguyen hanh quoc." (Expand Search), "nguyen khanh ngoc." (Expand Search)
"nguyen nhap quoc." » "nguyen nhat quoc." (Expand Search), "nguyen nhan quoc." (Expand Search), "nguyen nha quoc." (Expand Search)
"nguyen han quoc." » "nguyen phan quoc." (Expand Search), "nguyen nhan quoc." (Expand Search), "nguyen hanh quoc." (Expand Search), "nguyen tran quoc." (Expand Search), "nguyen hoc 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 khanh quoc.") OR ((("nguyen han quoc.") OR ("nguyen nhap quoc."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nguyen khanh quoc.\") OR (((\"nguyen han quoc.\") OR (\"nguyen nhap quoc.\"))))".
• Removing quotes may allow a broader search: (( nguyen khanh quoc. ) OR ((( nguyen han quoc. ) OR ( nguyen nhap quoc. )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen khanh quoc.") OR ((("nguyen han quoc.") OR ("nguyen nhap quoc."))))*.