Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thuc van » thuc vat, thuc dan, thuc va
su sach » so sach, vu sach
hanh di » hanh vi, hanh de, hang di
tuc van » truc van, tuc va, duc van
cau tre » cau tren, cau treo, cau tra
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
di cau » da cau, diem cau
va dau » va dao

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: su sach thu ((nang xa) OR (lang xa)) hoi. lieu va dau ((tuc van) OR (thuc van)) hanh di cau tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((nang xa) OR (lang xa)) hoi. lieu va dau ((tuc van) or (thuc van)) hanh di cau tre~".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((nang xa) OR (lang xa)) hoi. lieu va dau ((tuc van) or (thuc van)) hanh di cau tre*.