Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dung viet 19 slippers" » "nang viet 19 slippers", "cong viet 19 slippers", "mang viet 19 slippers", "dung viet 1 slippers", "dung viet 210 slippers", "dung viet 19 slippery", "dung viet 19 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 viet 19 slippers") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung viet 19 slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung viet 19 slippers ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung viet 19 slippers") or ("python using java snippets"))) or ("locating bug code snippets"))*.