Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hoc sach » hoc sinh, hoc anh
tai cua » thai cua, tai cuc, tri cua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hoc cac » hoc cao
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) OR (hoc cac)) ky lang xa hoi. lieu va cam ((luc va) or (tuc va)) thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc cac)) ky lang xa hoi. lieu va cam ((luc va) OR (tuc va)) thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc cac)) ky lang xa hoi. lieu va cam ((luc va) or (tuc va)) thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc cac)) ky lang xa hoi. lieu va cam ((luc va) or (tuc va)) thanh tai cua tre*.