Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
sang tao » hang tai
thuc cay » thuc day, thuc can, thuc cao
cay lanh » cao lan, cay lam, cay dan
lanh dai » lanh dao, lanh hai, lang dai
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, mang may, sang tai
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: vu sach v ((nang ma) or (((sang ma) or (sang tao)))) hoi. lieu va tham thuc cay lanh dai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach v ((nang ma) OR (((sang ma) OR (sang tao)))) hoi. lieu va tham thuc cay lanh dai cua su.
• Adding a wildcard symbol may retrieve word variants: vu sach v ((nang ma) or (((sang ma) or (sang tao)))) hoi. lieu va tham thuc cay lanh dai cua su*.