Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
sang ma » tang ma, sang tao, mang may
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
te sach » toc sach
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, nang cao, mang may
soc va » hoc va, loc va, doc 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) OR (sang ma)) hoi. hieu van cham soc 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) OR (sang ma)) hoi. hieu van cham soc va hanh di cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) y ((nang ma) OR (sang ma)) hoi. hieu van cham soc va hanh di cua viet*.