Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, dieu vu
hieu su » hieu sau, tieu su, hieu so
soc van » hoc van, sac van, soc dan
minh va » tinh va, sinh va, sinh vat
cuu tre » cua tre, cau tren, cau treo
oc van » hoc van, luoc van, quoc van
va cuu » va cau, va chu, va huu

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: tu sach ky nang xa hoi. ((hieu vu) OR (hieu su)) cham ((soc van) OR (oc van)) minh va cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu vu) or (hieu su)) cham ((soc van) OR (oc van)) minh va cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu vu) or (hieu su)) cham ((soc van) OR (oc van)) minh va cuu tre*.