Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"duong van dat snippets" » "duong va dat snippets", "luong va dat snippets", "dang van dat snippets", "duong van dao snippets", "duong van dau snippets", "duong dan dat snippets"
"locating bug core snippets" » "locating bug code snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java code snippets") OR ("duong van dat snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using java code snippets\") OR (\"duong van dat snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( using java code snippets ) OR ( duong van dat snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") OR ("duong van dat snippets"))) OR ("locating bug core snippets"))*.