Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tinh van » trinh van, dinh van, tinh va
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
va tinh » may tinh
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

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 ly nang ((x hoi) or (((o hoi) or (o hai)))). hieu va cam xuc va tinh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly nang ((x hoi) OR (((o hoi) OR (o hai)))). hieu va cam xuc va tinh van cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ly nang ((x hoi) or (((o hoi) or (o hai)))). hieu va cam xuc va tinh van cua tre*.