Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"nhan cua 2 snippets" » "nhat cua 2 snippets", "nhan luc 2 snippets", "nhan su 2 snippets", "nhan cua 20 snippets", "nhan cua 25 snippets", "nhan cua _ snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("nhan cua 2 snippets") OR ("python missing data snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nhan cua 2 snippets\") OR (\"python missing data snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( nhan cua 2 snippets ) OR ( python missing data snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhan cua 2 snippets") OR ("python missing data snippets"))) OR ("locating bug core snippets"))*.