Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
tuan hanh » tuan anh, quan hanh, toan hanh
luc tuan » luc luan, luc quan, luu tuan
cua tre » cua te, cuu tre, cua triet
cam luc » cam xuc, cau luc
xay hoi » xa hoi, cay phoi, gay thoi
hanh va » hang va, hanh vi
tay hoi » tay ho, tao hoi, tay thai
va cua » va chua, via cua, ca cua
sinh 2 » sinh y
2 dang » 2 danh, _ dang, b dang

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: hoc sinh 2 dang ((xay hoi) OR (tay hoi)). ((hieu qua) OR (hieu quan)) cam luc tuan hanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh 2 dang ((xay hoi) OR (tay hoi)). ((hieu qua) or (hieu quan)) cam luc tuan hanh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sinh 2 dang ((xay hoi) OR (tay hoi)). ((hieu qua) or (hieu quan)) cam luc tuan hanh va cua tre*.