Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
thu sach » tu sach, thuat sach, thuoc sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van
anh va » hanh va
va cua » va chua, via cua, ca cua

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 (nuoc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu ve cac lo van anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (nuoc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu ve cac lo van anh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (nuoc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu ve cac lo van anh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (nuoc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu ve cac lo van anh va cua tre*.