Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
ban hanh » ban hang
sach dao » lanh dao
sach tao » sach bao, sach tai, sach tham
hanh va » hang va, hanh vi
cuc ban » cua ban, cac ban, cuu ban
cam cuc » cam xuc, cham cuu, pham cuc
hieu ve » hieu va, hieu van
bac hoi » bac ho, bac hoc, bach hoa
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
va cua » va chua, via cua, ca 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 tao) or (sach dao)) nano ((bac hoi) or (sach hoi)). hieu ve cam cuc ban hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tao) OR (sach dao)) nano ((bac hoi) OR (sach hoi)). hieu ve cam cuc ban hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach tao) or (sach dao)) nano ((bac hoi) or (sach hoi)). hieu ve cam cuc ban hanh va cua tre*.