Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van du cong snippets" » "van du code snippets", "van duc cong snippets", "van tu cong snippets", "van vu cong snippets", "van duy cong snippets", "van dau cong snippets", "van de cong snippets"
"python using java snippets" » "python using data snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("van du 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: (((("van du cong snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( van du cong snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van du cong snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.