Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"dan toan dam snippets" » "van toan dam snippets", "dan than dam snippets", "manh toan dam snippets", "dan toan ban snippets", "dan toan tap snippets", "dan toan cao snippets"

Try widening your search to All Fields.

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