Perhaps you should try some spelling variations:
"nguyen can minh chi" » "nguyen van minh chi", "nguyen xuan minh chi", "nguyen cong minh chi", "nguyen cao minh chi", "nguyen ban minh chi", "nguyen can dinh chi", "nguyen can linh chi", "nguyen can minh chau"
"nguyen duc dinh thi" » "nguyen duc minh thi", "nguyen duc hinh thi", "nguyen duc kinh thi", "nguyen duc dinh tri"
"nguyen huu han chi" » "nguyen huu han che", "nguyen huu van chi", "nguyen huu san 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 minh chi") or ((("nguyen huu han chi") or ("nguyen duc dinh thi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nguyen can minh chi") OR ((("nguyen huu han chi") OR ("nguyen duc dinh thi")))).
• Removing quotes may allow a broader search: (( nguyen can minh chi ) or ((( nguyen huu han chi ) or ( nguyen duc dinh thi )))).
• Adding a wildcard symbol may retrieve word variants: (("nguyen can minh chi") or ((("nguyen huu han chi") or ("nguyen duc dinh thi"))))*.