Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va

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