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
co sach » cuon sach, hoc sach
bo sach » hoc sach
nang xa » nang x, lang xa, mang xa
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di 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: ((co sach) or (bo sach)) ky ((nang xa) OR (nang ma)) hoi. hieu thien hach nuoc va danh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (bo sach)) ky ((nang xa) OR (nang ma)) hoi. hieu thien hach nuoc va danh vi cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) or (bo sach)) ky ((nang xa) OR (nang ma)) hoi. hieu thien hach nuoc va danh vi cua tu*".