Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
canh thuc » anh thuc, danh thuc, can thuc
dinh dai » dinh dat, sinh dai, dinh dao
nang noi » nang doc
te sach » toc sach
va dinh » van dinh, va kinh, va tinh
hieu ve » hieu va, hieu van
sach ly » sach y, sach lo, sach ty
nang o » nang co, nang ho, nang ro
cua te » cua tu

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 o) or (nang noi)) hoi. hieu ve ((canh thuc) OR (cach thuc)) va dinh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly ((nang o) OR (nang noi)) hoi. hieu ve ((canh thuc) OR (cach thuc)) va dinh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly ((nang o) or (nang noi)) hoi. hieu ve ((canh thuc) OR (cach thuc)) va dinh dai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ly ((nang o) or (nang noi)) hoi. hieu ve ((canh thuc) OR (cach thuc)) va dinh dai cua te*.