Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
danh hai » dang hai, lanh hai, manh hai
duc manh » suc manh, duc anh, duc minh
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
hai cua » thai cua, dai cua, hoi cua
van cam » van nam, van lam, van cau
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
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: thuoc sach ((ky lang) or (ky tang)) xa hoi. hieu van cam ((duc ban) or (duc manh)) danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky lang) OR (ky tang)) xa hoi. hieu van cam ((duc ban) OR (duc manh)) danh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ky lang) or (ky tang)) xa hoi. hieu van cam ((duc ban) or (duc manh)) danh hai cua tre*.