Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hanh doi » thanh doi, hanh noi, hang doi
te sach » toc sach
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sach ly » sach y, sach lo, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, mang xa, ang xa
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: te sach ly ((((nang xa) OR (nang ma))) or (lang xa)) hoi. hieu ve cham thuc va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly ((((nang xa) OR (nang ma))) OR (lang xa)) hoi. hieu ve cham thuc va hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly ((((nang xa) OR (nang ma))) or (lang xa)) hoi. hieu ve cham thuc va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly ((((nang xa) OR (nang ma))) or (lang xa)) hoi. hieu ve cham thuc va hanh doi cua tre*.