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

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

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