Perhaps you should try some spelling variations:
khien hach » thien hach, khien thich, hien hanh
hach nuoc » sach nuoc, hoc nuoc, cac nuoc
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
so sac » so sach, so dac
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky ((nang xa) OR (lang xa)) hoi. dieu khien hach nuoc va danh vi cua cu~".
• Adding a wildcard symbol may retrieve word variants: so sac ky ((nang xa) OR (lang xa)) hoi. dieu khien hach nuoc va danh vi cua cu*.