Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
viet cua » viec cua, viet ca, viet qua
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
lo tuan » do tuan, le tuan, lo tan
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
cac lo » cac lop, cac co, cac bo

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 ((ky lang) or (ky tang)) xa hoi. hieu ve cac lo tuan anh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky tang)) xa hoi. hieu ve cac lo tuan anh viet cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) or (ky tang)) xa hoi. hieu ve cac lo tuan anh viet cua tre*.