Perhaps you should try some spelling variations:
"pham dung dat snippets" » "pham dang dat snippets", "pham dong dat snippets", "pham hung dat snippets", "pham dung va snippets", "pham dung tai snippets", "pham dung dat slippers"
"python using raw snippets" » "python using real snippets", "python using a snippets", "python using low snippets", "python using raw 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: (((("pham dung dat snippets") or ("python using raw snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pham dung dat snippets") OR ("python using raw snippets"))) OR ("locating bug code snippets")).
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