Perhaps you should try some spelling variations:
"dung thu cach snippets" » "dung thu code snippets", "ung thu cach snippets", "dung phu cach snippets", "dung thi cach snippets", "dung thuc cach snippets", "dung thu canh snippets", "dung tu cach snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java snippets"

Try widening your search to All Fields.

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