Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh hai » dang hai, lanh hai, manh hai
quoc ban » quoc bao, quoc lan, quoc quan
hai cua » thai cua, dai cua, hoi cua
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
va lam » van lam, va lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((tang xa) or (mang may)) hoi. hieu va lam ((quoc ban) or (duc van)) danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((tang xa) OR (mang may)) hoi. hieu va lam ((quoc ban) OR (duc van)) danh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((tang xa) or (mang may)) hoi. hieu va lam ((quoc ban) or (duc van)) danh hai cua tre*.