Perhaps you should try some spelling variations:
"dung tranh trong snippets" » "dung tran trong snippets", "dung trinh trong snippets", "dung anh trong snippets", "dung thanh trong snippets", "dong tranh trong snippets", "dung trong trong snippets"
"using 3 code slippers" » "using 3d code slippers", "using a code slippers", "using _ code slippers"
"locating bug code 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: (((("using 3 code slippers") or ("dung tranh trong snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using 3 code slippers") OR ("dung tranh trong snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using 3 code slippers ) or ( dung tranh trong snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using 3 code slippers") or ("dung tranh trong snippets"))) or ("locating bug code snippets"))*.