Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"cho den tran snippets" » "cho den tuan snippets", "cho den thanh snippets", "cho dang tran snippets", "cho dong tran snippets", "cham den tran snippets", "chen den tran 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 ("cho den tran snippets"))) or ("locating bug core snippets"))~.
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