Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"quan van cuc snippets" » "quan van code snippets", "luan van cuc snippets", "quan va cuc snippets", "quan luan cuc snippets", "quan van duc snippets", "quan van luc snippets", "quan van cu 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: (((("quan van cuc snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("quan van cuc snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( quan van cuc snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quan van cuc snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.