Perhaps you should try some spelling variations:
"dung tru trinh snippets" » "dung tra trinh snippets", "dung tru tinh snippets", "dung tieu trinh snippets", "dung tri trinh snippets", "dung thu trinh snippets", "dung tu trinh snippets", "dung tru trinh slippers"
"dung dat code snippets" » "dung va code snippets", "dung tai code snippets", "dung rate code snippets", "dung dat de snippets", "dung dat code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung tru trinh snippets") or ("dung dat code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung tru trinh snippets") OR ("dung dat code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tru trinh snippets ) or ( dung dat code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tru trinh snippets") or ("dung dat code snippets"))) or ("locating bug code snippets"))*.