Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"toan anh 2 snippets" » "toan hanh 2 snippets", "tuan anh 2 snippets", "tran anh 2 snippets", "toan anh d snippets", "toan anh _ snippets", "toan anh y snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("toan anh 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: "((((\"toan anh 2 snippets\") OR (\"python missing data snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( toan anh 2 snippets ) OR ( python missing data snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toan anh 2 snippets") OR ("python missing data snippets"))) OR ("locating bug core snippets"))*.