Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, nuoc sach
hanh vai » hanh vi, hanh va, hanh tai
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
co thuc » do thuc, co thua, mo thuc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cu lang » cua lang, tu lang, xu lang
va co » vo co

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 (thuoc sach)) cu lang xa hoi. hieu va co thuc va ((hanh vai) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) cu lang xa hoi. hieu va co thuc va ((hanh vai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) cu lang xa hoi. hieu va co thuc va ((hanh vai) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) cu lang xa hoi. hieu va co thuc va ((hanh vai) or (thanh tai)) cua tre*.