Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"sach xa trac snippets" » "sach dao trac snippets", "sach nha trac snippets", "sach bai trac snippets", "sach va trac snippets", "sach tap trac snippets", "sach gia trac 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: (((("sach xa trac snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("sach xa trac snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( sach xa trac snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach xa trac snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.