Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van duc hoi snippets" » "van duc code snippets", "van duy hoi snippets", "van du hoi snippets", "tran duc hoi snippets", "van duoc hoi snippets", "van duc hoa snippets", "van duc loi 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 duc hoi 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 duc hoi snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( van duc hoi snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van duc hoi snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.