Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dieu cua » dieu tra
hoc ngoc » hoc nuoc, ho ngoc, loc ngoc
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
va hoc » van hoc
va dap » va dao, va dau
ca dan » cac dan, ca dao

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

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