Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thanh doi » thanh loi, thanh moi, thanh do
va thanh » gia thanh, ban thanh, va tinh
doi cuu » doi cua, doi cuoc
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach kem
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu

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 ky) or (sach ty)) ((nang ma) or (nang x)) hoi. hieu ve cham thuc va thanh doi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) ((nang ma) OR (nang x)) hoi. hieu ve cham thuc va thanh doi cuu tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) ((nang ma) or (nang x)) hoi. hieu ve cham thuc va thanh doi cuu tre*.