Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"dao du cao snippets" » "dao du code snippets", "dao duc cao snippets", "dao duy cao snippets", "dao do cao snippets", "dao cu cao snippets", "dao du bao snippets", "dao vu cao snippets"

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

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