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