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