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