Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
vai cuu » vai cua
thuc va » thuc vat, thuc day
va pham » van pham, va phat, va phap
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, me hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang ((ma hoi) OR (ma hoa)). hieu va pham ((thuc va) OR (thuc dan)) thanh vai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty hang ((ma hoi) or (ma hoa)). hieu va pham ((thuc va) OR (thuc dan)) thanh vai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty hang ((ma hoi) or (ma hoa)). hieu va pham ((thuc va) OR (thuc dan)) thanh vai cuu tre*.