Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
bo sach » co sach
van cam » van nam, van lam, van cau
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
cau tre » cau tren, cau treo, cau tra
xuc va » duc va, tuc va, luc va
va cau » van cau, va cac, va dau
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: ((bo sach) or (hoc sach)) ky nang x hoi. hieu van cam xuc va tinh va cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (hoc sach)) ky nang x hoi. hieu van cam xuc va tinh va cau tre.
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (hoc sach)) ky nang x hoi. hieu van cam xuc va tinh va cau tre*.