Perhaps you should try some spelling variations:
tuong hieu » thuong hieu, trong hieu, guong hieu
sach tren » sach tien, sach tranh
dan tuong » ban tuong, dai tuong, dan trong
sach tri » sach tai, sach truc, sach bai
hieu hoc » lieu hoc, hieu hoa, tieu hoc
hoc giai » hoc giao, hoc dai, so giai
tue dan » tuc dan, te dan, tre dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach tri) or (sach tren)) tue dan tuong hieu hoc giai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tri) OR (sach tren)) tue dan tuong hieu hoc giai.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tri) or (sach tren)) tue dan tuong hieu hoc giai*.