Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"khu du doc snippets" » "khu du code snippets", "khu do doc snippets", "khu duy doc snippets", "khu du hoc snippets", "khu nu doc 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: (((("khu du doc snippets") or ("python using data snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khu du doc snippets") OR ("python using data snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( khu du doc snippets ) or ( python using data snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khu du doc snippets") or ("python using data snippets"))) or ("locating bug core snippets"))*.