Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nay thuc » nam thuc, cay thuc, day thuc
hoc cac » hoc cao
ky danh » ky anh, ky dang
danh xa » danh ca, dinh xa, canh xa
hieu va » lieu va, hieu qua
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 nay » va ngay, va cay
va dau » va dao

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) or (cuoc cach))) or (hoc cac)) ky danh xa hoi. hieu va nay thuc va dau vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((toc sach) OR (cuoc cach))) OR (hoc cac)) ky danh xa hoi. hieu va nay thuc va dau vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((((toc sach) or (cuoc cach))) or (hoc cac)) ky danh xa hoi. hieu va nay thuc va dau vai cuu tre*.