Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"dan vu cao snippets" » "dan vu code snippets", "doan vu cao snippets", "dan su cao snippets", "dan va cao snippets", "dan cu cao snippets"
"python using data snippets" » "python using java snippets", "python using sat snippets", "python missing 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: (((("python using data snippets") or ("dan vu cao snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using data snippets") OR ("dan vu cao snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using data snippets ) or ( dan vu cao snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using data snippets") or ("dan vu cao snippets"))) or ("locating bug core snippets"))*.