Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh tai, thanh oai
thanh van » thanh san, thanh toan, thanh phan
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
qua cam » qua cham, qua cac, qua ca
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu qua cam ((xuc va) or (duc va)) ((thanh vai) OR (thanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu qua cam ((xuc va) OR (duc va)) ((thanh vai) OR (thanh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu qua cam ((xuc va) or (duc va)) ((thanh vai) OR (thanh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu qua cam ((xuc va) or (duc va)) ((thanh vai) OR (thanh van)) cua tre*.