Perhaps you should try some spelling variations:
"dung a robot snippets" » "dung _ robot snippets", "dung tao robot snippets", "dung tay robot snippets", "dung va robot snippets", "dung ha robot snippets", "dung ai robot snippets", "dung a robot slippers"
"dung vbugss code snippets" » "dung vbugss core snippets", "dung vbugss code slippers", "dung vbungss code snippets", "dung vbugsss code snippets"
"locating bug code snippets" » "locating bug core 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: (((("dung vbugss code snippets") or ("dung a robot snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung vbugss code snippets") OR ("dung a robot snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung vbugss code snippets ) or ( dung a robot snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung vbugss code snippets") or ("dung a robot snippets"))) or ("locating bug code snippets"))*.