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
va hanh » van hanh, va thanh, va danh
te sach » toc sach
vu sach » vu bach, su sach, vu khach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
soc va » hoc va, loc va, doc va
vi cua » vai cua, di 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 (tang ma)) hoi. hieu van cham soc va hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) y ((nang ma) OR (tang ma)) hoi. hieu van cham soc va hanh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) y ((nang ma) OR (tang ma)) hoi. hieu van cham soc va hanh vi cua viet*.