Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
sach duoc » sach nuoc, sach dao, sach dung
cham thuc » nham thuc, pham thuc, tham thuc
thanh do » thanh de, thanh pho, thanh hoa
sach vuc » sach nuoc, sach truc, sach bac
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu van
do cuu » do huu, do cua, ho cuu

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 vuc) or (sach duoc)) nang x ho. ((hieu ve) OR (hieu va)) cham thuc vat thanh do cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vuc) OR (sach duoc)) nang x ho. ((hieu ve) OR (hieu va)) cham thuc vat thanh do cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach vuc) or (sach duoc)) nang x ho. ((hieu ve) OR (hieu va)) cham thuc vat thanh do cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach vuc) or (sach duoc)) nang x ho. ((hieu ve) OR (hieu va)) cham thuc vat thanh do cuu tre*.