Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue thuc » thuc thuc, thue thu, thu thuc
ban guong » ban huong, ban tuong, ban muong
thuc ban » thuoc ban, thuc dan, thu ban
hieu hoc » hieu hoa, tieu hoc, hieu thuoc
lieu hoc » lieu khoa, li hoc
tu sach » thu sach, su sach, te sach

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thue thuc ban guong ((hieu hoc) OR (lieu hoc)) giai~".
• Adding a wildcard symbol may retrieve word variants: tu sach thue thuc ban guong ((hieu hoc) OR (lieu hoc)) giai*.