Perhaps you should try some spelling variations:
kham cuu » cham cuu, khao cuu, kham chua
hieu su » hieu sau, tieu su, hieu so
su kham » su pham, vu kham, so kham
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach 2, sach vay
de dan » de dang, ke dan, le dan
di cua » dai cua, doi cua, de cua
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: te ((sach v) OR (sach y)) nang xa hoi. hieu su kham cuu ((de dan) OR (de dao)) di cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach y)) nang xa hoi. hieu su kham cuu ((de dan) OR (de dao)) di cua te~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang xa hoi. hieu su kham cuu ((de dan) OR (de dao)) di cua te*.