Perhaps you should try some spelling variations:
nang mai » nang tai, lang mai, nang cai
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
cam tuc » cam xuc, nam thuc, dam thuc
hanh di » hanh vi, hanh de, hang di
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
di cua » dai cua, doi cua, de cua
cam tu » cam thu, nam tu, dam tu
sach v » sach va, sach y, sach 2
cua te » cua tu

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: so sach v ((nang mai) OR (nang ma)) hoi. hieu ve ((cam tuc) OR (cam tu)) van hanh di cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v ((nang mai) OR (nang ma)) hoi. hieu ve ((cam tuc) or (cam tu)) van hanh di cua te~".
• Adding a wildcard symbol may retrieve word variants: so sach v ((nang mai) OR (nang ma)) hoi. hieu ve ((cam tuc) or (cam tu)) van hanh di cua te*.