Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"ca le doan snippets" » "ca le code snippets", "ca le dan snippets", "ca ly doanh snippets", "ca le hoang snippets", "cac le doan snippets", "cua le doan snippets", "va le doan snippets"
"locating bug core snippets" » "locating bug code snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("ca le doan snippets") OR ("python missing data snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"ca le doan snippets\") OR (\"python missing data snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( ca le doan snippets ) OR ( python missing data snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ca le doan snippets") OR ("python missing data snippets"))) OR ("locating bug core snippets"))*.