Perhaps you should try some spelling variations:
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
cac loc » cac lop, cac toc, cac hoc
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
hai cua » thai cua, hoi cua, lai cua
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky
ky van » ly van, ty van, ky va

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

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