Perhaps you should try some spelling variations:
tranh cong » thanh cong, trinh cong, tran cong
sach dang » sach dung, sach danh, sach nang
dang cong » dung cong
cong khi » cong thai, khong khi, co khi
tu sach » thu sach, tu cach, vu sach
te sach » toc sach
su sach » so sach, vu sach

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

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