Perhaps you should try some spelling variations:
"su sach tranh cong khi đong luc" » "su canh tranh cong khi đong luc", "su sach thanh cong khi đong luc", "su sach trinh cong khi đong luc", "su sach tran cong khi đong luc", "su sach tranh cong thai đong luc", "su sach tranh khong khi đong luc", "su sach tranh cong ha đong luc", "so sach tranh cong khi đong luc", "vu sach tranh cong khi đong luc"
"su danh ngon co khi đong luc" » "su danh nhan co khi đong luc", "su dinh ngoc co khi đong luc", "sau danh ngon co khi đong luc", "su doanh ngon co khi đong luc", "su dang ngon co khi đong luc", "su danh nguon coi khi đong luc", "su danh ngon keo khi đong luc", "su danh ngon doc 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 danh ngon co khi đong luc") or ("su sach tranh cong khi đong luc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su danh ngon co khi đong luc") OR ("su sach tranh cong khi đong luc")).
• Removing quotes may allow a broader search: (( su danh ngon co khi đong luc ) or ( su sach tranh cong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (("su danh ngon co khi đong luc") or ("su sach tranh cong khi đong luc"))*.