Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
ha tuc » ha thuc, va tuc, ha duc
xa duc » ha duc, xuan duc

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 ma hoa. hieu van ((ha tuc) OR (xa duc)) van hanh tai cua tre~.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoa. hieu van ((ha tuc) or (xa duc)) van hanh tai cua tre*.