Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
soc van » hoc van, oc van, sac van
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) OR (nang x)) hoi. hieu qua cham soc van hanh di cua vat~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) OR (nang x)) hoi. hieu qua cham soc van hanh di cua vat*.