Perhaps you should try some spelling variations:
xmang xa » lang xa, hoang xa, ang xa
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cac duc » cac du, cao duc, cac nuoc
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac dac » cac dan, cac dai, cac bac
sach ty » sach y, sach tu, sach thu
mang xa » lang xa, mang may, dang xay
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((xmang xa) or (mang xa)) hoi. hieu van ((cac duc) OR (cac dac)) va hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((xmang xa) OR (mang xa)) hoi. hieu van ((cac duc) OR (cac dac)) va hanh di cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((xmang xa) or (mang xa)) hoi. hieu van ((cac duc) OR (cac dac)) va hanh di cuu tre*".