Perhaps you should try some spelling variations:
danh tai » doanh tai, dinh tai, hanh tai
hieu van » hieu va, thien van, lieu va
van hau » van ha, van hai, van dau
va danh » va dinh, va dan, va hanh
sach tu » sach thu, cach tu, sach uu
nang xa » lang xa, nang ma, mang xa
hau tuc » cau truc, hieu tuc, thai tuc
sach ty » sach y, sach thu, xach tay
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 ty) OR (sach tu)) ((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 ty) OR (sach tu)) ((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 ty) OR (sach tu)) ((nang xa) or (nang x)) hoi. hieu van hau tuc va danh tai cuc te*.