Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"day thi cho snippets" » "dan thi cho snippets", "dao thi cho snippets", "dam thi cho snippets", "day thi choi snippets", "day thi tho snippets", "day thi thao 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: (((("day thi cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("day thi cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( day thi cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("day thi cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.