Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
van chat » cao chat
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, su sach, vu khach
hanh di » hanh vi, hanh de, hang di
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
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: ((te sach) OR (vu sach)) y nang ma hoi. hieu van chat ((soc va) OR (loc va)) hanh di cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) y nang ma hoi. hieu van chat ((soc va) OR (loc va)) hanh di cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) y nang ma hoi. hieu van chat ((soc va) OR (loc va)) hanh di cua viet*.