Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuoc ma » hoc ma, duoc ma
hieu van » thien van, lieu va, hieu ve
thuoc va » thuc va, thuong va, thuoc tai
hanh di » hanh vi, hanh de, hang di
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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 ly nang ma hoi. ((hieu van) OR (hieu va)) nam ((thuoc va) OR (thuoc ma)) hanh di cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang ma hoi. ((hieu van) or (hieu va)) nam ((thuoc va) OR (thuoc ma)) hanh di cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang ma hoi. ((hieu van) or (hieu va)) nam ((thuoc va) OR (thuoc ma)) hanh di cua viet*.