Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dang xay » dang van, van xay
lang xa » lang ha, lang van
sach ky » sac ky, sach y, sach ty
qua nam » quan nam, cua nam, qua nhat
thuc va » thuc vat, thuc dan, thuc day
dau vai » dau va, dau hai, dau tai
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
va dau » va dao

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: hoc sach ky ((lang xa) OR (dang xay)) hoi. hieu ((qua nam) OR (quang nam)) thuc va dau vai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky ((lang xa) or (dang xay)) hoi. hieu ((qua nam) OR (quang nam)) thuc va dau vai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky ((lang xa) or (dang xay)) hoi. hieu ((qua nam) OR (quang nam)) thuc va dau vai cuu tre*.