Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
dinh dat » dinh ket, dinh van, dinh lam
tham tuc » tham thuc, thai tuc, nham thuc
van tham » van thanh, van tuan, van chat
dat cua » dai cua, day cua, mat cua
xa dinh » xac dinh, va dinh, ba dinh
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (nuoc sach)) ky ((nang xa) OR (lang xa)) hoi. thien van tham tuc xa dinh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (nuoc sach)) ky ((nang xa) OR (lang xa)) hoi. thien van tham tuc xa dinh dat cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (nuoc sach)) ky ((nang xa) OR (lang xa)) hoi. thien van tham tuc xa dinh dat cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (nuoc sach)) ky ((nang xa) OR (lang xa)) hoi. thien van tham tuc xa dinh dat cua tre*.