Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
trinh van » trinh han, trinh quan, trinh toan
hieu van » hieu va, thien van, lieu va
va trinh » van trinh, va tinh, lap trinh
so sach » so sanh, bo sach, co sach
van cam » van nam, van lam, van cau
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
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: ((so sach) or (thuoc sach)) ky nang x hoi. hieu van cam xuc va trinh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (thuoc sach)) ky nang x hoi. hieu van cam xuc va trinh van cua tre.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (thuoc sach)) ky nang x hoi. hieu van cam xuc va trinh van cua tre*.