Perhaps you should try some spelling variations:
doc sach » toc sach, nuoc sach, dac sac
danh tai » doanh tai, dinh tai, hanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
van hau » van ha, van hai, van dau
nang xa » lang xa, nang ma, mang xa
va danh » va dinh, va dan, va hanh
hau tuc » cau truc, hieu tuc, thai tuc
tuc va » thuc va, truc va, tuc xa
cuc te » cua te, cuc thue, cuc tieu

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: ((doc sach) OR (hoc sach)) ty ((nang xa) OR (nang x)) hoi. hieu van hau tuc va danh tai cuc te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (hoc sach)) ty ((nang xa) or (nang x)) hoi. hieu van hau tuc va danh tai cuc te~".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) OR (hoc sach)) ty ((nang xa) or (nang x)) hoi. hieu van hau tuc va danh tai cuc te*.