Perhaps you should try some spelling variations:
"using data core snippets" » "using java core snippets", "using sat core snippets", "missing data core snippets"
"tran manh han snippets" » "tran minh han snippets", "tran thanh han snippets", "tran van han snippets", "tran manh hai snippets", "tran manh hon snippets", "tran anh han snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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: "((((\"using data core snippets\") OR (\"tran manh han snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using data core snippets ) OR ( tran manh han snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using data core snippets") OR ("tran manh han snippets"))) OR ("locating bug code snippets"))*.