Perhaps you should try some spelling variations:
"trinh thu hai snippets" » "trinh thuc hai snippets", "trinh thuy hai snippets", "trinh thue hai snippets", "trinh thu ha snippets", "trinh thu nhap snippets", "trinh thu hang snippets", "trinh thu hai 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 thu hai 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 thu hai snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh thu hai snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh thu hai snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.