Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
va thieu » va thiet, va hieu, va tieu
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
ma hoi » mai hoi, xa hoi, ma hoa

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 ly nang ma hoi. hieu ve ((nam thuc) or (nha thuoc)) va hanh vai ((va triet) or (va thieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoi. hieu ve ((nam thuc) OR (nha thuoc)) va hanh vai ((va triet) OR (va thieu)).
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoi. hieu ve ((nam thuc) or (nha thuoc)) va hanh vai ((va triet) or (va thieu))*.