Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
sang tao » hang tai
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, mang may
va tham » van tham, va cham, va thanh
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
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: tu sach y ((sang ma) or (sang tao)) hoi. lieu va tham thuc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((sang ma) OR (sang tao)) hoi. lieu va tham thuc va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((sang ma) or (sang tao)) hoi. lieu va tham thuc va danh vai cua tre*.