Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ham toan do snippets" » "tam toan do snippets", "hach toan do snippets", "nham hoan do snippets", "ham toan ho snippets", "ham toan co snippets", "ham 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: (((("ham 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: (((("ham toan do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ham toan do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ham toan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.