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

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 y ((xang xa) OR (ang xa)) hoi. hieu va cam thuc ((va dan) or (van hanh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((xang xa) OR (ang xa)) hoi. hieu va cam thuc ((va dan) OR (van hanh)) di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((xang xa) OR (ang xa)) hoi. hieu va cam thuc ((va dan) or (van hanh)) di cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((xang xa) OR (ang xa)) hoi. hieu va cam thuc ((va dan) or (van hanh)) di cuu tre*.