Perhaps you should try some spelling variations:
ban hang » ngan hang
dang xay » dang van, van xay
cac duc » cac du, cao duc, cac dac
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
su tai » su thi, tu tai
tai ky » thai ky, trai ky, sai ky
ve cac » va cac, vien cac
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su tai ky dang xay hoi. hieu ve cac duc ((ban hanh) or (ban hang)) tri ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su tai ky dang xay hoi. hieu ve cac duc ((ban hanh) OR (ban hang)) tri ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su tai ky dang xay hoi. hieu ve cac duc ((ban hanh) or (ban hang)) tri ((cua tre) or (cua te))*.