Perhaps you should try some spelling variations:
"dang java java slippers" » "dang va java slippers", "dang java java slippery", "dang java java grippers"
"dung viet data snippets" » "nang viet data snippets", "cong viet data snippets", "mang viet data snippets", "dung viet dat snippets", "dung viet ta snippets", "dung lieu data 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: (((("dang java java slippers") or ("dung viet data snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang java java slippers") OR ("dung viet data snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang java java slippers ) or ( dung viet data snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang java java slippers") or ("dung viet data snippets"))) or ("locating bug code snippets"))*.