Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang van » hoang van, hang va
dang dan » dang dang, dung dan, tang dan
dang xay » van xay
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
dan dan » ban dan, dao dan, dan dat
cuu tre » cua tre, cau tren, cau treo
am hoc » ad hoc
ca cuu » cap cuu, cua cuu, ca cua
va am » va lam, va cam

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: toc sach ky ((dang xay) OR (dang van)) hoi. hieu va am hoc ((dan dan) OR (dang dan)) ca cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((dang xay) or (dang van)) hoi. hieu va am hoc ((dan dan) OR (dang dan)) ca cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((dang xay) or (dang van)) hoi. hieu va am hoc ((dan dan) OR (dang dan)) ca cuu tre*.