Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh ha » thanh hoa, thanh hai, nhanh ha
thuc ban » thuoc ban, thuc dan, thu ban
cam thuc » am thuc, nam thuc, cam thu
van cam » van nam, van lam, van cau
su sach » so sach, vu sach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
ha cua » hoa cua, hai cua, nha cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v ((nang ma) OR (sang ma)) hoi. hieu van cam thuc ban thanh ha cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang ma) OR (sang ma)) hoi. hieu van cam thuc ban thanh ha cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang ma) OR (sang ma)) hoi. hieu van cam thuc ban thanh ha cua tre*.