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

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 am thuc ((((va hanh) or (va dan))) 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 am thuc ((((va hanh) OR (va dan))) OR (van hanh)) di cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty xang xa hoi. hieu va am thuc ((((va hanh) or (va dan))) or (van hanh)) di cuu tre*.