Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang xay » dang van, van xay
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
tac ban » tai ban, cac ban, tao ban
doi cua » dai cua, hoi cua
ve cac » va cac, vien cac
di cua » dai cua, de cua, do 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 ky dang xay hoi. hieu ve cac tac ban thanh ((di cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu ve cac tac ban thanh ((di cua) OR (doi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu ve cac tac ban thanh ((di cua) or (doi cua)) tre*.