Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"using son thanh slippers" » "using low thanh slippers", "using one thanh slippers", "using sat thanh slippers", "using ban thanh slippers", "using van thanh slippers", "using son thanh slippery", "using son thanh 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 ("using son thanh slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("using son thanh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( using son thanh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("using son thanh slippers"))) or ("locating bug code snippets"))*.