Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh cong » thanh cong, trinh cong, tran cong
sach phan » sach han, mach phan, sach phat
cong thai » cong hai, cong thanh, cong tac
hong thai » hong ha, hinh thai
toc sach » hoc sach, doc sach, thuoc sach
cong khi » khong khi, co khi, cong ha
tu sach » thu sach, su sach, te sach

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

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