Perhaps you should try some spelling variations:
"nguyen thu tinh chat" » "nguyen thi tinh chat", "nguyen nhu tinh chat", "nguyen tu tinh chat", "nguyen thue tinh chat", "nguyen thuy tinh chat", "nguyen thuc tinh chat", "nguyen thu tinh nhat", "nguyen thu tinh phat"
"nguyen can dinh chi" » "nguyen xuan dinh chi", "nguyen cong dinh chi", "nguyen manh dinh chi", "nguyen cac dinh chi", "nguyen tran dinh chi", "nguyen can dinh thi", "nguyen can dinh tri", "nguyen can dinh moi"
"nguyen van dinh chi" » "nguyen van dinh thi", "nguyen van dinh tri", "nguyen van dinh moi", "nguyen van minh chi", "nguyen van dich chi", "nguyen va dinh chi"

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

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