Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh hai » thanh hai, nhanh hai, hang hai
te sach » toc sach
cao suc » cao su
hai cua » thai cua, dai cua, hoi cua
xa hanh » xa thanh, xa khanh, va hanh
cao duc » dao duc, giao duc, tao duoc
dong ha » dong hoa, dong va, dong hoc
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuoc sach)) tu dong ha noi. hieu qua ((cao duc) or (cao suc)) xa hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) tu dong ha noi. hieu qua ((cao duc) OR (cao suc)) xa hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) tu dong ha noi. hieu qua ((cao duc) or (cao suc)) xa hanh hai cua tre*.