Perhaps you should try some spelling variations:
"trinh hoan hao snippets" » "trinh han hao snippets", "trinh hoa hao snippets", "trinh toan hao snippets", "trinh hoang hai snippets", "trinh soan thao snippets", "trinh van hao snippets", "trinh hoan hao slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh hoan hao snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh hoan hao snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh hoan hao snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh hoan hao snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.