Perhaps you should try some spelling variations:
"nguoi cao cong." » "nguoi dao cong." (Expand Search), "nguoi cham cong." (Expand Search), "nguoi dan cong." (Expand Search), "nguoi cao cuong." (Expand Search), "nguoi cho cong." (Expand Search), "nguoi bao cong." (Expand Search)
"nguoi vao cong." » "nguoi dao cong." (Expand Search), "nguoi va cong." (Expand Search), "nguoi van cong." (Expand Search), "nguoi bo cong." (Expand Search), "nguoi cac cong." (Expand Search), "nguoi o cong." (Expand Search)
"nguoi lao cong." » "nguoi dao cong." (Expand Search), "nguoi dan cong." (Expand Search), "nguoi ha cong." (Expand Search), "nguoi lao dong." (Expand Search), "nguoi bao cong." (Expand Search), "nguoi tao cong." (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: (("nguoi cao cong.") OR ((("nguoi vao cong.") OR ("nguoi lao cong."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nguoi cao cong.\") OR (((\"nguoi vao cong.\") OR (\"nguoi lao cong.\"))))".
• Removing quotes may allow a broader search: (( nguoi cao cong. ) OR ((( nguoi vao cong. ) OR ( nguoi lao cong. )))).
• Adding a wildcard symbol may retrieve word variants: (("nguoi cao cong.") OR ((("nguoi vao cong.") OR ("nguoi lao cong."))))*.