Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
ban thanh » ban hang
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
dai dua » dai cua, dai sua, dai luan
sach ty » sach y, sach tu, sach thu
dai dac » dam dac, dai mac, dai dich
ty nang » ky nang, ty xang, ty hang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang x hoi. hieu vien ((dai dac) or (dai dua)) ((ban thanh) or (ban hanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang x hoi. hieu vien ((dai dac) OR (dai dua)) ((ban thanh) OR (ban hanh)) vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang x hoi. hieu vien ((dai dac) or (dai dua)) ((ban thanh) or (ban hanh)) vai cuu tre*.