Perhaps you should try some spelling variations:
"nhan vat xu chinh tri viet." » "nhan vat su chinh tri viet." (Expand Search), "nhan vat tu chinh tri viet." (Expand Search), "nhan vat nu chinh tri viet." (Expand Search), "nhan vat xu chinh thi viet." (Expand Search), "nhan vat xu chinh dai viet." (Expand Search), "nhan vat xu chinh hoi viet." (Expand Search), "nhan vat xa chinh tri viet." (Expand Search), "nhan vat cu chinh tri viet." (Expand Search), "phan vat xu chinh tri viet." (Expand Search)
"nhan vat xu chi tai viet." » "nhan vat xu chi tai lieu." (Expand Search), "nhan vat tu chi tai viet." (Expand Search), "nhan vat xa chi tai viet." (Expand Search), "nhan vat cu chi tai viet." (Expand Search), "phan vat xu chi tai viet." (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: (("nhan vat xu chinh tri viet.") OR ("nhan vat xu chi tai viet."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nhan vat xu chinh tri viet.\") OR (\"nhan vat xu chi tai viet.\"))".
• Removing quotes may allow a broader search: (( nhan vat xu chinh tri viet. ) OR ( nhan vat xu chi tai viet. )).
• Adding a wildcard symbol may retrieve word variants: (("nhan vat xu chinh tri viet.") OR ("nhan vat xu chi tai viet."))*.