Perhaps you should try some spelling variations:
"nhan vat chat chinh tri viet." » "nhan vat chan chinh tri viet." (Expand Search), "nhan vat thuat chinh tri viet." (Expand Search), "nhan vat che chinh tri viet." (Expand Search), "nhan cao chat chinh tri viet." (Expand Search), "nhan vat chat chinh tai viet." (Expand Search), "nhan vat chat chinh thi viet." (Expand Search), "nhan vat chat chinh dai viet." (Expand Search), "phan vat chat chinh tri viet." (Expand Search)
"nhan vat cua chinh tri kien." » "nhan vat luan chinh tri kien." (Expand Search), "nhan vat cua chinh trien kien." (Expand Search), "nhan vat cua chinh tri kinh." (Expand Search), "phan vat cua chinh tri kien." (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 cua chinh tri kien.") OR ("nhan vat chat chinh tri viet."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nhan vat cua chinh tri kien.\") OR (\"nhan vat chat chinh tri viet.\"))".
• Removing quotes may allow a broader search: (( nhan vat cua chinh tri kien. ) OR ( nhan vat chat chinh tri viet. )).
• Adding a wildcard symbol may retrieve word variants: (("nhan vat cua chinh tri kien.") OR ("nhan vat chat chinh tri viet."))*.