Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cam thuc » am thuc, nam thuc, cam thu
va danh » va dinh, va dan, va hanh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
di cuu » di cau, di cua, dinh cuu

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 ty xang xa hoi. hieu va cam thuc ((((ban hanh) or (va danh))) or (van hanh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang xa hoi. hieu va cam thuc ((((ban hanh) OR (va danh))) OR (van hanh)) di cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty xang xa hoi. hieu va cam thuc ((((ban hanh) or (va danh))) or (van hanh)) di cuu tre*.