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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. ((hieu van) or (thien van)) hac thuc day dan vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. ((hieu van) OR (thien van)) hac thuc day dan vi ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. ((hieu van) or (thien van)) hac thuc day dan vi ((cua tre) or (cau treo))*.