Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
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
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, ma hoa, me hoi
di cuu » di cau, di cua, dinh cuu
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 ((ma hoi) OR (xa hoi)). lieu va dau ((tuc van) OR (thuc van)) hanh di cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang ((ma hoi) OR (xa hoi)). lieu va dau ((tuc van) or (thuc van)) hanh di cuu tre~".
• Adding a wildcard symbol may retrieve word variants: su sach thu nang ((ma hoi) OR (xa hoi)). lieu va dau ((tuc van) or (thuc van)) hanh di cuu tre*.