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