Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
dang hai » dang khai, hang hai, dung hai
hai cua » thai cua, dai cua, hoi cua
duc van » duc va, duc tan, duc manh
cuc ban » cua ban, cac ban, cuu ban
hieu va » lieu va, hieu qua
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
va lam » van lam, va lap
ha hoi » hoa hoi, ha noi, xa hoi

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) or (tu sach)) ky lang ha hoi. hieu va lam ((cuc ban) or (duc van)) dang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky lang ha hoi. hieu va lam ((cuc ban) OR (duc van)) dang hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky lang ha hoi. hieu va lam ((cuc ban) or (duc van)) dang hai cua tre*.