Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, pham thuoc
tham thuc » nham thuc, pham thuc, tam thuc
danh doi » danh di, thanh doi, dung doi
cua tre » cua te, cuu tre, cua triet
doi cua » dai cua, hoi cua
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
sac ky » cac ky
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sac ky) or (sai ky)) nang x hoi. hieu ve ((cham thuc) or (tham thuc)) va danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sai ky)) nang x hoi. hieu ve ((cham thuc) OR (tham thuc)) va danh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sai ky)) nang x hoi. hieu ve ((cham thuc) or (tham thuc)) va danh doi cua tre*.