Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van cua doc snippets" » "van cua code snippets", "vang cua doc snippets", "ban cua doc snippets", "dan cua doc snippets", "van cua duoc snippets", "van cua duc snippets", "van cua hoc 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: (((("van cua 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: (((("van cua doc snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( van cua doc snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van cua doc snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.