Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
su sach » so sach, vu sach
ke cau » ket cau
ve cau » va cau, ve cac, le cau
de cua » le cua, dieu cua
te cua » tue cua, le cua
x hoi » xa hoi, o hoi, x ho

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 van nang x hoi. hieu ((ve cau) OR (ke cau)) truc van hanh ((de cua) OR (te cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach van nang x hoi. hieu ((ve cau) OR (ke cau)) truc van hanh ((de cua) or (te cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su sach van nang x hoi. hieu ((ve cau) OR (ke cau)) truc van hanh ((de cua) or (te cua)) tre*.