Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
hac thuc » hoc thuc, ha thuc, thach thuc
van hac » van hoc, van ha, van hai
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
v nang » va nang, vu nang, van nang
y nang » ky nang, ly nang, may nang
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
cua tu » cua tuc, cua su, cua cu

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 ((y nang) OR (v nang)) xa hoi. hieu van hac thuc va dan vi ((cua tu) OR (cau treo))~.
• Adding a wildcard symbol may retrieve word variants: so sach ((y nang) or (v nang)) xa hoi. hieu van hac thuc va dan vi ((cua tu) or (cau treo))*.