Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hao mon toan snippets" » "hao manh toan snippets", "hao minh toan snippets", "hao nin toan snippets", "hat mon toan snippets", "hau mon toan snippets", "ho mon 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: (((("hao mon 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: (((("hao mon toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hao mon toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hao mon toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.