Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nao toan hoc snippets" » "bao toan hoc snippets", "ngoc toan hoc snippets", "nao thanh hoc snippets", "nao toan khoa snippets", "nao van hoc snippets", "nao hoa hoc 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: (((("nao toan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nao toan hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nao toan hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nao toan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.