Perhaps you should try some spelling variations:
so nganh » so ngan, hoc nganh, moi nganh
van hanh » van thanh, ban hanh, van anh
nganh ky » nganh y, nganh xay, hanh ky
cau tren » cu tren, dau tren, ca tren
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
va danh » va dinh, va dan, va hanh
va cau » van cau, va cac, va dau
vi cau » ve cau, di cau, viet cau
cau du » cau do, cac du, cau tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so nganh ky dang xay hoi. hieu va cau du ((van hanh) or (va danh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so nganh ky dang xay hoi. hieu va cau du ((van hanh) OR (va danh)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: so nganh ky dang xay hoi. hieu va cau du ((van hanh) or (va danh)) vi cau tren*.