Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
hieu van » thien van, lieu va, hieu ve
thuoc va » thuc va, thuoc ma, thuong va
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
lo nang » ho nang, loai nang, cao nang
ca viet » va viet, co viet, hoa viet
ma hoi » mai hoi, xa hoi, ma hoa
di ca » di cau, di cua, doi ca

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((lo nang) OR (ly nang)) ma hoi. ((hieu van) OR (hieu va)) nha thuoc va hanh di ca viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((lo nang) OR (ly nang)) ma hoi. ((hieu van) or (hieu va)) nha thuoc va hanh di ca viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((lo nang) OR (ly nang)) ma hoi. ((hieu van) or (hieu va)) nha thuoc va hanh di ca viet*.