Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thuat van » thuat san, thuat va, thuat ban
thanh vai » thanh hai, thanh van, thanh tai
dang xay » dang van, van xay
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
van ty » van ky, van tu, van te

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat van ty ((tang ma) or (dang xay)) hoi. hieu va cac duc ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat van ty ((tang ma) OR (dang xay)) hoi. hieu va cac duc ban thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat van ty ((tang ma) or (dang xay)) hoi. hieu va cac duc ban thanh vai cua tre*.