Perhaps you should try some spelling variations:
"trinh van trinh snippets" » "trinh han trinh snippets", "trinh quan trinh snippets", "trinh toan trinh snippets", "trinh van thinh snippets", "trinh van tinh snippets", "trinh dan trinh snippets", "trinh van trinh 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"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh van trinh 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 trinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh van trinh snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh van trinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.