Perhaps you should try some spelling variations:
vat danh » va danh, van danh, luat danh
can thuc » dan thuc, van thuc, cay thuc
cau thuc » cau truc, cuu thuc, cau phuc
tu cach » tu cac
danh vi » hanh vi, dinh vi, danh di
hieu ve » hieu va, hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
vi cua » vai cua, di cua

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

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