Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vat thanh » dat thanh, gat thanh, tat thanh
hieu van » hieu va, thien van, lieu va
thanh ve » hanh ve, thanh va, thanh vien
tang van » dang van, hoang van, trong van
cam thuc » am thuc, nam thuc, cam thu
cua tre » cua te, cua triet, dua tren
van cam » van nam, van lam, van cau
tang ma » mang may
cuu tre » cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y ((tang ma) or (tang van)) hoi. hieu van cam thuc vat thanh ve ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((tang ma) OR (tang van)) hoi. hieu van cam thuc vat thanh ve ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((tang ma) or (tang van)) hoi. hieu van cam thuc vat thanh ve ((cua tre) or (cuu tre))*.