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