Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"manh ba tran snippets" » "manh cua tran snippets", "danh bat tran snippets", "manh hai tran snippets", "manh ban tran snippets", "manh bao tran snippets", "manh ba trao snippets", "manh ba tran 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: (((("manh ba tran snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("manh ba tran snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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