Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » hieu qua
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
dan va » doan va, ban va, han va

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

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