Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"hao van cong snippets" » "hao van code snippets", "hao van dong snippets", "hao van phong snippets", "hao phan cong snippets", "dao van cong snippets", "ho van cong snippets", "cao van cong 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: (((("hao van cong snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hao van cong snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hao van cong snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hao van cong snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.