Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"van ton duc snippets" » "van toan duc snippets", "van tan duc snippets", "van toi duc snippets", "van tran duc snippets", "van tong cuc snippets", "van tinh duc snippets", "van ton duc slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("van ton duc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van ton duc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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