Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu danh toc snippets" » "ngu anh toc snippets", "ngu dan toc snippets", "ngan danh toc snippets", "ngu danh hoc snippets", "ngu danh thuc 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: (((("ngu danh toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu danh toc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu danh toc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu danh toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.