Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"luc toan hoc snippets" » "luc toan code snippets", "duc toan hoc snippets", "quoc toan hoc snippets", "luc tai hoc snippets", "luc toan khoa snippets", "luc van hoc snippets", "luc 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: (((("luc 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: (((("luc toan hoc snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( luc toan hoc snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luc toan hoc snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.