Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"cong dan doc snippets" » "cong dan code snippets", "cong san doc snippets", "cong tan doc snippets", "huong dan doc snippets", "cong dan toc snippets", "cong dan hoc snippets", "cong 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: (((("cong 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: (((("cong dan doc snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong dan doc snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong dan doc snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.