Perhaps you should try some spelling variations:
dang xay » dang van, van xay
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
cac lop » cac hop, cac loai
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
vai cua » dai cua, hai cua, lai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky dang xay hoi. hieu va cac lop ((va hanh) or (va danh)) ((vai cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky dang xay hoi. hieu va cac lop ((va hanh) OR (va danh)) ((vai cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky dang xay hoi. hieu va cac lop ((va hanh) or (va danh)) ((vai cua) or (di cua)) tre*.