Perhaps you should try some spelling variations:
dan guong » dan phuong, doan cuong, dang cuong
hieu thuc » hieu thuoc, hieu tuc, lieu thuc
hien thuc » kien thuc, bien thuc, hien thu
sach tri » sach tai, sach tren, sach truc
tu sach » thu sach, su sach, te sach
tri tre » tri tren, tri tue, tuoi tre
tre dan » tre dang, te dan, tre can

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 tri tre dan guong ((hieu thuc) OR (hien thuc)) giai~".
• Adding a wildcard symbol may retrieve word variants: tu sach tri tre dan guong ((hieu thuc) OR (hien thuc)) giai*.