Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau thuc » cau truc, cuu thuc, can thuc
cua tre » cua te, cuu tre, dua tren
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
tu cach » tu cac
hieu ve » hieu va, hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
ve cau » ke cau, va cau, ve cac

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 noi. hieu ve cau thuc va danh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (te sach)) ky lang ha noi. hieu ve cau thuc va danh vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky lang ha noi. hieu ve cau thuc va danh vi ((cua tre) or (cua triet))*.