Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh vai » thanh hai, thanh tai, thanh oai
thu sach » tu sach, thuat sach, thuoc sach
nang tai » hang tai, tang tai, sang tai
tai khoa » da khoa, noi khoa
dua ban » dia ban, cua ban, qua ban
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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 tai khoa. hieu ((ve cam) or (va cac)) dua ban ((thanh vai) or (thanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang tai khoa. hieu ((ve cam) OR (va cac)) dua ban ((thanh vai) OR (thanh van)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang tai khoa. hieu ((ve cam) or (va cac)) dua ban ((thanh vai) or (thanh van)) cua tre*.