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