Perhaps you should try some spelling variations:
vanh tai » van tai, hanh tai, anh tai
vanh dai » van dai, lanh dao, van dao
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, nam thuc
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
tuc va » thuc va, truc va, tuc xa
s_ hai » su hai, so hai
va cam » va cham, va cac, va cao

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: su sach ty nang ((_ hai) OR (s_ hai)). hieu va cam tuc va ((vanh dai) OR (vanh tai)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((_ hai) or (s_ hai)). hieu va cam tuc va ((vanh dai) OR (vanh tai)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((_ hai) or (s_ hai)). hieu va cam tuc va ((vanh dai) OR (vanh tai)) cuu tre*.