Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
nang tai » hang tai, tang tai, sang tai
tai khoa » da khoa, noi khoa
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, ve cai

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

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