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

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)) ((via cua) OR (gia 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)) ((via cua) OR (gia cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang mai hoi. hieu va bao bo ((ban hanh) or (va thanh)) ((via cua) OR (gia 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)) ((via cua) OR (gia cua)) tre*.