Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"luan kinh o2 snippets" » "luan kinh code snippets", "xuan kinh o2 snippets", "luat kinh o2 snippets", "luan chinh o2 snippets", "luan kinh hoc snippets", "luan kinh mon snippets", "luan kinh doc 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: (((("luan kinh o2 snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luan kinh o2 snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( luan kinh o2 snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan kinh o2 snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.