Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
ve triet » va trien, su triet
hanh mai » hanh ma, hanh mau, hanh may
nam truc » nam truoc, nam thuc, nam trung
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va nang » van nang, da nang, cam nang
xa nong » xa dong, xuat nong, may nong
ma hoi » mai hoi, xa hoi, ma hoa
mai ve » mai va, moi ve, dai ve

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 ((xa nong) or (va nang)) ma hoi. hieu va ((lam truoc) or (nam truc)) va hanh mai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((xa nong) OR (va nang)) ma hoi. hieu va ((lam truoc) OR (nam truc)) va hanh mai ve triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((xa nong) or (va nang)) ma hoi. hieu va ((lam truoc) or (nam truc)) va hanh mai ve triet*.