Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"han thi doan snippets" » "han thai doan snippets", "han thi hoan snippets", "han thi loan snippets", "phan thi doan snippets", "ha thi doan snippets", "dan thi doan 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: (((("han thi doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("han thi doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( han thi doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("han thi doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.