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