Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cac truc » cau truc, cac tru, cac trung
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
ty mang » ty xang, ty hang, tin mang
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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: ((te sach) OR (toc sach)) ty mang xa hoi. hieu va cac truc va thanh vi cua tu~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty mang xa hoi. hieu va cac truc va thanh vi cua tu*.