Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"phap hoc len snippets" » "phap hoan len snippets", "phap mo len snippets", "phap han len snippets", "phap hoc le snippets", "phap hoc hien snippets", "phap hoc luan snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("phap hoc len snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
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