Perhaps you should try some spelling variations:
"nguyen thoi dinh tri" » "nguyen thai dinh tri", "nguyen hai dinh tri", "nguyen chi dinh tri", "nguyen hoi dinh tri", "nguyen thoi minh tri", "nguyen thoi tinh tri", "nguyen thoi chinh tri"
"nguyen thu dinh tri" » "nguyen nhu dinh tri", "nguyen tu dinh tri", "nguyen huu dinh tri", "nguyen thu chinh tri", "nguyen thu minh tri", "nguyen chu dinh tri", "nguyen thu kinh tri"
"nguyen thi hanh chi" » "nguyen thi thanh chi", "nguyen thi banh chi", "nguyen thi danh chi", "nguyen thi hanh che"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("nguyen thi hanh chi") or ((("nguyen thoi dinh tri") OR ("nguyen thu dinh tri"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen thi hanh chi") OR ((("nguyen thoi dinh tri") OR ("nguyen thu dinh tri")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nguyen thi hanh chi\") or (((\"nguyen thoi dinh tri\") OR (\"nguyen thu dinh tri\"))))".
• Removing quotes may allow a broader search: (( nguyen thi hanh chi ) or ((( nguyen thoi dinh tri ) OR ( nguyen thu dinh tri )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen thi hanh chi") or ((("nguyen thoi dinh tri") OR ("nguyen thu dinh tri"))))*.