Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
ban thanh » ban hang
thu sach » thuat sach, thuoc sach, thu hoach
ban hanh » ban hang
vien dai » hien dai
dai duc » dao duc, dai dua, mai duc
tu sach » su sach, te sach, tu cach
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
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) OR (tu sach)) ky nang x hoi. hieu vien dai duc ((ban thanh) or (ban hanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang x hoi. hieu vien dai duc ((ban thanh) OR (ban hanh)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang x hoi. hieu vien dai duc ((ban thanh) or (ban hanh)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky nang x hoi. hieu vien dai duc ((ban thanh) or (ban hanh)) vai cuu tre*.