Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cuu tre » cua tre, cau tren, cau treo
y xang » ty xang
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
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 y xang xa hoi. hieu va cham thuc ((((va dan) OR (ca 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 hoi. hieu va cham thuc ((((va dan) OR (ca 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 hoi. hieu va cham thuc ((((va dan) OR (ca dan))) or (van hanh)) di cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach y xang xa hoi. hieu va cham thuc ((((va dan) OR (ca dan))) or (van hanh)) di cuu tre*.