Perhaps you should try some spelling variations:
kham cuu » cham cuu, khao cuu, kham chua
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
doi cua » dai cua, hoi cua
sach v » sach va, sach 2, sach vay
cuu de » cuu ve
di cua » dai cua, de cua, do 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 v) OR (sach y)) nang xa hoi. hieu vu kham cuu de dao ((di cua) OR (doi 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 vu kham cuu de dao ((di cua) OR (doi cua)) te~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang xa hoi. hieu vu kham cuu de dao ((di cua) OR (doi cua)) te*.