Perhaps you should try some spelling variations:
"trinh van sac snippets" » "trinh han sac snippets", "trinh quan sac snippets", "trinh toan sac snippets", "trinh van sach snippets", "trinh van hac snippets", "trinh ban sac snippets", "trinh van sac slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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