Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu tin he snippets" » "thuc tin he snippets", "tu tin he snippets", "thu hien he snippets", "thu tinh he snippets", "thu tin ha snippets", "thu tin hieu 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 tin he 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 tin he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu tin he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu tin he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.