Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
dinh dau » dinh dat, danh dau, dinh dao
tham tuc » tham thuc, thai tuc, nham thuc
van tham » van thanh, van tuan, van chat
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
dinh du » dinh duc, dinh cu, dinh tu
cua tre » cua te, cuu tre, cua triet
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: thuoc sach ky ((nang xa) or (lang xa)) hoi. thien van tham tuc va ((dinh dau) OR (dinh du)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((nang xa) OR (lang xa)) hoi. thien van tham tuc va ((dinh dau) OR (dinh du)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((nang xa) or (lang xa)) hoi. thien van tham tuc va ((dinh dau) OR (dinh du)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang xa) or (lang xa)) hoi. thien van tham tuc va ((dinh dau) OR (dinh du)) cua tre*.