Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van khoa cuu snippets" » "van hoa cuu snippets", "von khoa cuu snippets", "san khoa cuu snippets", "van khoa cua snippets", "van khoa chau snippets", "van hoa cua 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: (((("van khoa cuu snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van khoa cuu snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van khoa cuu snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van khoa cuu snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.