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

Try widening your search to All Fields.

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