Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
qua cao » qua cac, qua ca, qua cai
cao suc » cao su, cao duc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
suc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de cua
x hoi » o hoi, x ho, 5 hoi

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) or (xa hoi)). hieu qua cao suc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((x hoi) OR (xa hoi)). hieu qua cao suc va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((x hoi) or (xa hoi)). hieu qua cao suc va hanh di cua tre*.