Perhaps you should try some spelling variations:
sach thue » sach thu, sach tham, cach thuc
hanh vai » hanh va, hanh tai, hanh van
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
luc va » duc va, tuc va, loc va
va cam » va cham, va cac, va cao
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) OR (sach thieu)) nang x hoi. hieu va cam 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) OR (sach thieu)) nang x hoi. hieu va cam 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) OR (sach thieu)) nang x hoi. hieu va cam luc va ((hanh vai) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach thue) OR (sach thieu)) nang x hoi. hieu va cam luc va ((hanh vai) or (hanh vi)) cua tre*.