Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang vat » dang van, dong vat, dang nhat
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
dan vat » van vat, dan va, dan dat
dan vai » dan va, dan tai, den vai
cuu tre » cua tre, cau tren, cau treo
thuc ca » thuc cua, thuc can, thuc cao
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang xa hoi. hieu va nam thuc ca ((dan vai) or (((dan vat) OR (dang vat)))) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. hieu va nam thuc ca ((dan vai) OR (((dan vat) OR (dang vat)))) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xa hoi. hieu va nam thuc ca ((dan vai) or (((dan vat) OR (dang vat)))) cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xa hoi. hieu va nam thuc ca ((dan vai) or (((dan vat) OR (dang vat)))) cuu tre*.