Perhaps you should try some spelling variations:
hanh duoc » hanh thuoc, nganh duoc, doanh duoc
duoc cua » duoc sua, nuoc cua, doc cua
ban hanh » ban hang
va cham » va chat, va tham
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
nang so » nang som, nang co, nang ho
so hai » son hai, su hai, so ha
va cam » va cac, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach y)) nang so hai. hieu ((va cam) or (va cham)) duc ban hanh duoc cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang so hai. hieu ((va cam) OR (va cham)) duc ban hanh duoc cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang so hai. hieu ((va cam) or (va cham)) duc ban hanh duoc cua tre*.