Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
su sach » so sach, vu sach
hanh de » hanh ve, hanh kem
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
nang xa » lang xa, mang xa, ang xa
ve cau » ke cau, va cau, ve cac
de cua » le cua, te cua, dieu cua

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