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