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