Perhaps you should try some spelling variations:
"dung soat chat snippets" » "dung soat code snippets", "dung dat chat snippets", "dung sai chat snippets", "dung san chat snippets", "dung hoat chat snippets", "dung sat chat snippets", "dung suat chat 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 soat chat 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 soat chat snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
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