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
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, mang xa, ang xa
nang ma » tang ma, sang ma, nang cao
va dinh » van dinh, va kinh, va tinh
dinh di » dinh du, dinh vi, danh di
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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

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