Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"kim ho toan snippets" » "kim hop toan snippets", "kim hoa toan snippets", "kim so toan snippets", "kim hao toan snippets", "kim hyo 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: (((("kim ho 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: (((("kim ho toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( kim ho toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("kim ho toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.