Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hieu thien » hieu hien, chieu chien, dieu khien
hach nuoc » sach nuoc, hoc nuoc, cac nuoc
nang xa » lang xa, nang ma, mang xa
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
so dac » so dan
dac ky » cac ky, dan ky, sac 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.

• Performing a fuzzy search may retrieve terms with similar spellings: so dac ky ((nang xa) OR (nang x)) hoi. hieu thien hach nuoc ((va danh) or (va hanh)) vi cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so dac ky ((nang xa) OR (nang x)) hoi. hieu thien hach nuoc ((va danh) OR (va hanh)) vi cua cu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so dac ky ((nang xa) OR (nang x)) hoi. hieu thien hach nuoc ((va danh) or (va hanh)) vi cua cu*".