Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong so toan snippets" » "dong son toan snippets", "dong co toan snippets", "cong so toan snippets", "dong so tan snippets", "dong so than snippets", "dong bao 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: (((("dong so 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: (((("dong so toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong so toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong so toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.