Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
hieu van » thien van, lieu va, hieu ve
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
me hoi » le hoi

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: tu sach ty nang ((me hoi) OR (xa hoi)). ((hieu van) OR (hieu va)) cac vuc van hanh thai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((me hoi) or (xa hoi)). ((hieu van) OR (hieu va)) cac vuc van hanh thai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((me hoi) or (xa hoi)). ((hieu van) OR (hieu va)) cac vuc van hanh thai cua tre*.