Perhaps you should try some spelling variations:
"dac san toan snippets" » "dac san code snippets", "dac van toan snippets", "dac dan toan snippets", "dac manh toan snippets", "dac sac toan snippets", "cac san toan snippets", "dac nhan toan snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("python using java snippets") or ("dac san toan snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("dac san toan snippets"))) OR ("locating bug core snippets")).
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