Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue nang » thien nang, thuat nang, thi nang
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh va, hanh tai, hanh van
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
va cam » va cac, va cao, va cai
luc va » duc va, tuc va, loc 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: toc sach thue nang x hoi. hieu ((va cam) OR (va cham)) luc va ((hanh vai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thue nang x hoi. hieu ((va cam) OR (va cham)) luc va ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thue nang x hoi. hieu ((va cam) OR (va cham)) luc va ((hanh vai) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach thue nang x hoi. hieu ((va cam) OR (va cham)) luc va ((hanh vai) or (hanh vi)) cua tre*.