Perhaps you should try some spelling variations:
sach thuat » sach tham, cac thuat, sach phat
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
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 thuat) OR (dich thuat)) nang x hoi. hieu va cam ((xuc va) or (tuc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach thuat) OR (dich thuat)) nang x hoi. hieu va cam ((xuc va) OR (tuc va)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach thuat) OR (dich thuat)) nang x hoi. hieu va cam ((xuc va) or (tuc va)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach thuat) OR (dich thuat)) nang x hoi. hieu va cam ((xuc va) or (tuc va)) hanh vai cua tre*.