Perhaps you should try some spelling variations:
sach tren » sach tien, sach tranh
dan tuong » ban tuong, dai tuong, dan trong
hieu thuc » hieu thuoc, hien thuc, lieu thuc
tren tue » tren que, tren thuc, tri tue
hieu tuc » hieu luc, hieu thuoc, lieu thuc
su sach » so sach, vu sach
tue dan » tuc dan, te dan, tre dan

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: "su sach tren tue dan tuong ((hieu tuc) OR (hieu thuc)) giai~".
• Adding a wildcard symbol may retrieve word variants: su sach tren tue dan tuong ((hieu tuc) OR (hieu thuc)) giai*.