Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tri hoi toan snippets" » "tri hop toan snippets", "tri boi toan snippets", "tri hoa toan snippets", "tri hoc toan snippets", "tri doi toan snippets", "tri moi toan 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: (((("tri hoi toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tri hoi toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tri hoi toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tri hoi toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.