Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu tuan do snippets" » "chu tuan do snippets", "thu trang do snippets", "thu thuat do snippets", "thu toan do snippets", "thu truan doi snippets", "thu quan doi 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: (((("thu tuan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thu tuan do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu tuan do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu tuan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.