Perhaps you should try some spelling variations:
hieu sau » hieu suat, tieu su, hieu va
dan den » ban den, van den, dan dung
te sach » toc sach
hieu su » tieu su, hieu so, hieu suat
nang xa » nang x, lang xa, nang ma
sach 2 » sach y
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
2 nang » v nang
den cu » dien cu, den su, dan cu
cu tre » cu tren, cua tre, cuu tre

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 2 nang xa hoi. ((hieu su) OR (hieu sau)) cham ((soc va) OR (loc va)) dan den cu tre~.
• Adding a wildcard symbol may retrieve word variants: te sach 2 nang xa hoi. ((hieu su) or (hieu sau)) cham ((soc va) or (loc va)) dan den cu tre*.