Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc tang cho snippets" » "do tang cho snippets", "duc tang cho snippets", "soc trang cho snippets", "doc trang cho snippets", "doc sang cho snippets", "doc hang cho 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: (((("doc tang 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: (((("doc tang cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc tang cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc tang cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.