Perhaps you should try some spelling variations:
ban hanh » ban hang
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cay phoi » cap phoi, tay hoi, cay cho
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, gay thoi
ky dang » ky nang, ky danh
di cua » dai cua, doi cua, de cua
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang ((xay hoi) OR (cay phoi)). hieu va cac nuoc ((ban hanh) or (gia thanh)) di cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ((xay hoi) OR (cay phoi)). hieu va cac nuoc ((ban hanh) OR (gia thanh)) di cua cu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang ((xay hoi) OR (cay phoi)). hieu va cac nuoc ((ban hanh) or (gia thanh)) di cua cu*".