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

Try widening your search to All Fields.

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