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