Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu danh le snippets" » "ngu anh le snippets", "ngu dan le snippets", "ngan danh le snippets", "ngu dinh le snippets", "ngu manh le 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 le 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 le snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu danh le snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu danh le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.