Perhaps you should try some spelling variations:
"manh dung cac snippets" » "manh hung cac snippets", "manh tung cac snippets", "anh dung cac snippets", "manh luong cac snippets", "manh dung cho snippets", "manh dung tai 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: (((("dung va java snippets") or ("manh dung cac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung va java snippets") OR ("manh dung cac snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung va java snippets") or ("manh dung cac snippets"))) or ("locating bug code snippets"))*.