Perhaps you should try some spelling variations:
kham cuu » cham cuu, khao cuu, kham chua
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach 2, sach vay
cuu ve » cuu va
ve dan » ke dan, le dan, va dan
dan vi » doan vi, don vi, dan va
cua tu » cua tuc, cua su, cua cu

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 ve dan vi ((cua te) OR (cua tu))~.
• 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 ve dan vi ((cua te) OR (cua tu))~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang xa hoi. hieu vu kham cuu ve dan vi ((cua te) OR (cua tu))*.