Perhaps you should try some spelling variations:
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
va tuan » van tuan, va quan, va toan
va hanh » va thanh, va danh, ban hanh
luu tre » luu tru, cuu tre, luy tre
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky dang xay hoi. hieu va tuan le ((va hanh) or (van hanh)) vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang xay hoi. hieu va tuan le ((va hanh) OR (van hanh)) vi luu tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky dang xay hoi. hieu va tuan le ((va hanh) or (van hanh)) vi luu tre*.