Perhaps you should try some spelling variations:
"dung tra trinh snippets" » "dung qua trinh snippets", "dung tri trinh snippets", "dung tru trinh snippets", "dung tren trinh snippets", "dung tra trinh slippers"
"dung rate code snippets" » "dung dat code snippets", "dung vat code snippets", "dung mat code snippets", "dung rate code slippers", "dung rate core snippets"
"locating bug code snippets" » "locating bug code slippers", "locating bug core snippets", "locating bung code snippets", "locating bugs code snippets"

You may be able to get more results by adjusting your search query.

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