Perhaps you should try some spelling variations:
nhan duc » nhan duoc, nhan luc, phan duc
hanh mai » hanh ma, hanh mau, hanh may
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
hieu vu » hieu va, hieu ve, hieu su
vu nhan » cu nhan, vu ngan, tu nhan
va hanh » van hanh, va thanh, va danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (nang x)) hoi. hieu vu nhan duc va hanh mai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang x)) hoi. hieu vu nhan duc va hanh mai va triet.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (nang x)) hoi. hieu vu nhan duc va hanh mai va triet*.