Perhaps you should try some spelling variations:
duc thuan » duc thang, duc phan, duc thanh
vanh tai » van tai, hanh tai, anh tai
te sach » toc sach
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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: te sach y nang x hoi. hieu vu cham ((duc thuan) OR (duc tan)) vanh tai ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. hieu vu cham ((duc thuan) OR (duc tan)) vanh tai ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu vu cham ((duc thuan) OR (duc tan)) vanh tai ((cua tre) or (cua te))*.