Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau thuc » cau truc, cuu thuc, cau phuc
can thuc » dan thuc, van thuc, cay thuc
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu ve » hieu va, hieu van
hanh de » hanh ve, hanh kem
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang ha hoi. hieu ve ((cau thuc) OR (can thuc)) dan ((hanh de) or (hanh vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ha hoi. hieu ve ((cau thuc) OR (can thuc)) dan ((hanh de) OR (hanh vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang ha hoi. hieu ve ((cau thuc) OR (can thuc)) dan ((hanh de) or (hanh vi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ha hoi. hieu ve ((cau thuc) OR (can thuc)) dan ((hanh de) or (hanh vi)) cua triet*.