Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dieu cua » dieu tra
va thanh » gia thanh, ban thanh, va tinh
sach uu » sach luu, sach tu, sach xu
va hanh » van hanh, va danh, ban hanh
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
va cau » van cau, va cac, va dau

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