Perhaps you should try some spelling variations:
hanh nam » thanh nam, hanh lam, hanh ngay
su sach » so sach, vu sach
ty mang » ty hang, tin mang, tri mang
may hoi » may thoi, tay hoi, mai hoi
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
duc van » duc va, duc manh, duc phan
cua tre » cua te, cuu tre, cua triet

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 ((ty mang) or (ty xang)) may hoi. hieu vu cham ((duc van) OR (duc tan)) hanh nam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty mang) OR (ty xang)) may hoi. hieu vu cham ((duc van) OR (duc tan)) hanh nam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty mang) or (ty xang)) may hoi. hieu vu cham ((duc van) OR (duc tan)) hanh nam cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty mang) or (ty xang)) may hoi. hieu vu cham ((duc van) OR (duc tan)) hanh nam cua tre*.