Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh cong » thanh cong, trinh cong, tran cong
thuoc khi » truoc khi, thuoc phai, thuoc tai
nha thuoc » nha nuoc, nhan thuc, nha hoc
cong khi » cong thai, khong khi, co khi
vu sach » vu bach, su sach, vu khach
tu cach » tu cac
te sach » toc sach

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

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