Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"danh do anh slippers" » "dang do anh slippers", "danh co anh slippers", "danh di anh slippers", "danh do sanh slippers", "danh do danh slippers", "danh do anh slippery", "danh do anh grippers"
"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 java java snippets") or ("danh do anh slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("danh do anh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( danh do anh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("danh do anh slippers"))) or ("locating bug code snippets"))*.