Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using data snippets" » "python using java snippets", "python using sat snippets", "python missing data snippets"
"co viet dao snippets" » "co viet lao snippets", "co viet bao snippets", "co viet da snippets", "so viet dao snippets", "o viet dao snippets", "hoc viet dao snippets"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"co viet dao snippets\") OR (\"python using data snippets\"))) OR (\"locating bug core snippets\"))~".
• Removing quotes may allow a broader search: (((( co viet dao snippets ) OR ( python using data snippets ))) OR ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("co viet dao snippets") OR ("python using data snippets"))) OR ("locating bug core snippets"))*.