Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"van su cao snippets" » "van su code snippets", "dan su cao snippets", "van cu cao snippets", "van vu cao snippets", "van su co 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 ("van su 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 (\"van su cao snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( python missing data snippets ) OR ( van su cao snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python missing data snippets") OR ("van su cao snippets"))) OR ("locating bug core snippets"))*.