Perhaps you should try some spelling variations:
"tran quynh cac snippets" » "tran quang cac snippets", "tran quy cac snippets", "truc quynh cac snippets", "tran quanh cac snippets", "tran quynh lan snippets", "tran quynh cu snippets"
"dung va java snippets" » "dung java java snippets"
"locating bug code snippets" » "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: (((("tran quynh cac snippets") or ("dung va java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran quynh cac snippets") OR ("dung va java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("tran quynh cac snippets") or ("dung va java snippets"))) or ("locating bug code snippets"))*.