Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
soc van » hoc van, oc van, sac van
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
vu khac » vu kham, vu khanh, bui khac
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
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: ((tu sach) OR (vu khac)) y ((nang xa) OR (nang ma)) hoi. hieu ve cham soc van hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu khac)) y ((nang xa) OR (nang ma)) hoi. hieu ve cham soc van hanh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu khac)) y ((nang xa) OR (nang ma)) hoi. hieu ve cham soc van hanh vi cua viet*.