Perhaps you should try some spelling variations:
"nguyen tham quoc." » "nguyen thai quoc." (Expand Search), "nguyen tam quoc." (Expand Search), "nguyen thanh quoc." (Expand Search), "nguyen han quoc." (Expand Search)
"nguyen thao quoc." » "nguyen thai quoc." (Expand Search), "nguyen tho quoc." (Expand Search), "nguyen hao quoc." (Expand Search), "nguyen han quoc." (Expand Search)
"nguyen pham quoc." » "nguyen phan quoc." (Expand Search), "nguyen khac quoc." (Expand Search), "nguyen hai quoc." (Expand Search), "nguyen pham ngoc." (Expand Search), "nguyen tam quoc." (Expand Search), "nguyen pham duc." (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 tham quoc.") OR ("nguyen thao quoc."))) OR ("nguyen pham quoc."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nguyen tham quoc.\") OR (\"nguyen thao quoc.\"))) OR (\"nguyen pham quoc.\"))".
• Removing quotes may allow a broader search: (((( nguyen tham quoc. ) OR ( nguyen thao quoc. ))) OR ( nguyen pham quoc. )).
• Adding a wildcard symbol may retrieve word variants: (((("nguyen tham quoc.") OR ("nguyen thao quoc."))) OR ("nguyen pham quoc."))*.