Perhaps you should try some spelling variations:
tranh cong » thanh cong, trinh cong, tran cong
sach tranh » canh tranh
cuon sach » duong sach, cuoc cach, co sach
sanh ngo » danh ngon, canh ngon, sach ngon
cac khoi » cac thoi, cac khoan, cach thoi
cong khi » cong thai, khong khi, co khi
dac khi » dau khi, cac khi, dac khoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( do sanh ngo ((dac khi) OR (cac khoi)) đong luc ) OR ( cuon sach tranh cong khi đong luc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( do sanh ngo ((dac khi) OR (cac khoi)) đong luc ) or ( cuon sach tranh cong khi đong luc ))~".
• Adding a wildcard symbol may retrieve word variants: (( do sanh ngo ((dac khi) OR (cac khoi)) đong luc ) or ( cuon sach tranh cong khi đong luc ))*.