Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
hoc sach » hoc sinh, hoc cac, hoc anh
than cua » nhan cua, thai cua, ban cua
ky lang » ky dang, ky tang, tay lang
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((ky lang) OR (ky nang)) xa hoi. lieu va cam ((luc va) or (tuc va)) thanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky lang) OR (ky nang)) xa hoi. lieu va cam ((luc va) OR (tuc va)) thanh than cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ky lang) OR (ky nang)) xa hoi. lieu va cam ((luc va) or (tuc va)) thanh than cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky lang) OR (ky nang)) xa hoi. lieu va cam ((luc va) or (tuc va)) thanh than cua tre*.