Perhaps you should try some spelling variations:
sach tranh » canh tranh
chong lai » chong li, cong lai, thong lai
chong mai » chong ma, thuong mai, phuong mai
sach ngan » sach ngon, sach nha, sach han
ngan cong » nganh cong, nganh nong, ngan hang
tu sach » thu sach, te sach, tu cach
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 tranh ((chong lai) OR (chong mai)) đong luc ) or ( su sach ngan cong _ đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tranh ((chong lai) OR (chong mai)) đong luc ) OR ( su sach ngan cong _ đong luc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach tranh ((chong lai) OR (chong mai)) đong luc ) or ( su sach ngan cong _ đong luc ))*".