Perhaps you should try some spelling variations:
sach thanh » sach tranh, sach tham, danh thanh
cong thai » cong hai, hong thai, cong thanh
cao thanh » dao thanh, cho thanh, cac thanh
thanh hoa » thanh pho
cong khi » khong khi, co khi, cong ha
so sach » so sanh, bo sach, co sach
hoa khi » hoa phi, hoa hi, hoa thi
su cao » cu cao, vu cao, su co

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach thanh ((cong khi) OR (cong thai)) đong luc ) or ( su cao thanh hoa khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach thanh ((cong khi) OR (cong thai)) đong luc ) OR ( su cao thanh hoa khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sach thanh ((cong khi) OR (cong thai)) đong luc ) or ( su cao thanh hoa khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( so sach thanh ((cong khi) OR (cong thai)) đong luc ) or ( su cao thanh hoa khi đong luc ))*.