Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sach trinh » sach tranh, hanh trinh, sach kinh
tran cong » tran hong, trien cong, tran hoang
cong thai » cong hai, hong thai, cong thanh
toc sach » hoc sach, doc sach, thuoc sach
trinh co » trinh do, trinh cong, trinh hoa
thu sach » tu sach, thuoc sach, thu hoach

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 trinh co khi đong luc ) or ( ((thu sach) OR (thuat sach)) tran cong thai đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach trinh co khi đong luc ) OR ( ((thu sach) OR (thuat sach)) tran cong thai đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( toc sach trinh co khi đong luc ) or ( ((thu sach) OR (thuat sach)) tran cong thai đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( toc sach trinh co khi đong luc ) or ( ((thu sach) OR (thuat sach)) tran cong thai đong luc ))*.