Perhaps you should try some spelling variations:
khai luoc » hai huoc, hai luom, dai luoc
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu khai » vu kham, vu hai, vu khac
luoc va » nuoc va, duoc va, loc va
hoc dai » hoc dan
sach v » sach va, sach 2, sach vay
va hoc » van hoc
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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 khai luoc va hoc dai ((cua tu) OR (cua cu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach y)) nang xa hoi. hieu vu khai luoc va hoc dai ((cua tu) OR (cua cu))~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang xa hoi. hieu vu khai luoc va hoc dai ((cua tu) OR (cua cu))*.