Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"can hoc dung snippets" » "can hoc ung snippets", "can hoc dan snippets", "can hoc cong snippets", "van hoc dung snippets", "dan hoc dung snippets", "cao hoc dung snippets"

Try widening your search to All Fields.

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