Perhaps you should try some spelling variations:
"dung land tranh slippers" » "dung lan tranh slippers", "dung lanh tranh slippers", "dung canh tranh slippers", "dung luan tranh slippers", "dung lam tranh slippers", "dung san tranh slippers", "dung land tranh slippery", "dung land tranh grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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

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