Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"gioi toan do snippets" » "gioi van do snippets", "gioi tai do snippets", "boi toan do snippets", "gioi toan ho snippets", "gioi toan co snippets", "gioi toan du 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: (((("gioi toan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("gioi toan do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( gioi toan do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("gioi toan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.