Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
ban hanh » ban hang
va thanh » gia thanh, ban thanh, va tinh
giau cua » gian cua, gia cua, dieu cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va bao » va bai
bao bo » bac bo, ban bo, nao bo

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 ky nang mai hoi. hieu va bao bo ((ban hanh) or (va thanh)) giau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang mai hoi. hieu va bao bo ((ban hanh) OR (va thanh)) giau cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang mai hoi. hieu va bao bo ((ban hanh) or (va thanh)) giau cua tre*.