Perhaps you should try some spelling variations:
"su can tranh cong khi đong luc" » "su can thanh cong khi đong luc", "su can trinh cong khi đong luc", "su can tran cong khi đong luc", "su canh tranh cong khi đong luc", "su tan tran cong khi đong luc", "su van ranh cong khi đong luc", "su can tranh cong thai đong luc", "su can tranh khong khi đong luc", "su can tranh cong ha đong luc", "su van tranh cong khi đong luc", "su cao tranh cong khi đong luc", "tu can tranh cong khi đong luc"
"su sach ngan co khi đong luc" » "su sach ngon co khi đong luc", "su sach nha co khi đong luc", "su sach han co khi đong luc", "so sach ngan co khi đong luc", "vu sach ngan co khi đong luc", "su sach nganh co khi đong luc", "su sach nhan co khi đong luc"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("su sach ngan co khi đong luc") or ("su can tranh cong khi đong luc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach ngan co khi đong luc") OR ("su can tranh cong khi đong luc")).
• Removing quotes may allow a broader search: (( su sach ngan co khi đong luc ) or ( su can tranh cong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (("su sach ngan co khi đong luc") or ("su can tranh cong khi đong luc"))*.