Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hac thuc » hoc thuc, thach thuc, thuc thuc
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
ha thuc » va thuc, ha thuy, ha thu
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va

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 xa hoi. hieu van ((hac thuc) OR (ha thuc)) va dan vi ((cua tre) OR (cau treo))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. hieu van ((hac thuc) OR (ha thuc)) va dan vi ((cua tre) or (cau treo))~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. hieu van ((hac thuc) OR (ha thuc)) va dan vi ((cua tre) or (cau treo))*.