Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
vat danh » va danh, van danh, luat danh
danh dai » danh dau, danh di, danh sai
sach ty » sach tu, sach thu, xach tay
hang xa » hoang xa, hang va, hang ca
cua tre » cua te, cuu tre, cua triet

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 ty) OR (sach y)) hang xa hoi. hieu van cham thuc vat danh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ty) OR (sach y)) hang xa hoi. hieu van cham thuc vat danh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ty) OR (sach y)) hang xa hoi. hieu van cham thuc vat danh dai cua tre*.