Perhaps you should try some spelling variations:
bach dang » bach dan, bach khang, cach mang
sach van » sach han, sach va, cach van
bach van » bach dan, cach van, bach xuan
cam truc » cau truc, nam truc, lam truoc
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach van) or (((bach van) OR (bach dang)))) nang x ho. hieu ve cam truc van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach van) OR (((bach van) OR (bach dang)))) nang x ho. hieu ve cam truc van hanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach van) or (((bach van) OR (bach dang)))) nang x ho. hieu ve cam truc van hanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach van) or (((bach van) OR (bach dang)))) nang x ho. hieu ve cam truc van hanh de cua tre*.