Perhaps you should try some spelling variations:
dang nganh » duong nganh, dung ngan, dang hanh
nhan cong » nhanh cong, phan cong, nhap cong
nganh co » nganh cong, nganh hoa, nganh y
cong khi » cong thai, khong khi, cong ha
so dang » su dang, so dan, so dung
su can » su van, tu can, su han
su cao » cu cao, vu cao, su co

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( so dang nganh co khi đong luc ) OR ( ((su can) OR (su cao)) nhan cong khi đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (( so dang nganh co khi đong luc ) or ( ((su can) or (su cao)) nhan cong khi đong luc ))*.