Perhaps you should try some spelling variations:
sach thuat » sach tham, dich thuat, cac thuat
thuat nang » thuat bang, thuat mang, thuat trang
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh va, hanh tai, hanh van
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cai
luc va » duc va, tuc va, loc va
va cao » va cac, va co, va dao

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 thuat nang xa hoi. hieu ((va cam) OR (va cao)) luc va ((hanh vai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thuat nang xa hoi. hieu ((va cam) OR (va cao)) luc va ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thuat nang xa hoi. hieu ((va cam) OR (va cao)) luc va ((hanh vai) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach thuat nang xa hoi. hieu ((va cam) OR (va cao)) luc va ((hanh vai) or (hanh vi)) cua tre*.