Perhaps you should try some spelling variations:
"dong thuoc a snippets" » "dung thuoc a snippets", "dang thuoc a snippets", "don thuoc a snippets", "dong thuoc ma snippets", "dong thuoc va snippets", "dong thuoc la snippets", "dong thuoc a slippers"
"python using java snippets" » "python using data snippets", "python using java 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: (((("dong thuoc a snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong thuoc a snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong thuoc a snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong thuoc a snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.