Perhaps you should try some spelling variations:
truong doi » truong dai, trong doi, truong hoi
xa truong » cac truong
cau tren » cu tren, dau tren, ca tren
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau treo
cam tuc » cam xuc, cam tu, nam thuc
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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: so sach ty nang ((x hoi) OR (o hoi)). hieu va cam tuc xa truong doi ((cuu tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang ((x hoi) OR (o hoi)). hieu va cam tuc xa truong doi ((cuu tre) or (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang ((x hoi) OR (o hoi)). hieu va cam tuc xa truong doi ((cuu tre) or (cau tren))*.