Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thuc day » thuc dan, thuc vat
day vanh » day manh, day danh, day nhanh
vanh dai » van dai, vanh tai, lanh dao
su sach » so sach, vu sach
sang ma » tang ma, nang ma, sang tao
va tham » van tham, va cham, va thanh
sach v » sach va, sach y, sach 2
cua su » qua su

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 v ((mang may) or (sang ma)) hoi. lieu va tham thuc day vanh dai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((mang may) OR (sang ma)) hoi. lieu va tham thuc day vanh dai cua su.
• Adding a wildcard symbol may retrieve word variants: su sach v ((mang may) or (sang ma)) hoi. lieu va tham thuc day vanh dai cua su*.