Perhaps you should try some spelling variations:
tuong hieu » thuong hieu, trong hieu, guong hieu
sach tham » sach nha
thuc ban » thuoc ban, thu ban, thuc van
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
hieu so » thieu so
so giao » so giai, hoc giao

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 tham ((thuc ban) or (thuc dan)) tuong hieu so giao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tham ((thuc ban) OR (thuc dan)) tuong hieu so giao.
• Adding a wildcard symbol may retrieve word variants: tu sach tham ((thuc ban) or (thuc dan)) tuong hieu so giao*.