Perhaps you should try some spelling variations:
vat dinh » va dinh, van dinh, vat sinh
cau thuc » cau truc, cuu thuc, can thuc
tu cach » tu cac
cua tre » cuu tre, cua triet, dua tren
dinh vi » dinh ve, dinh viet, dinh tri
hieu ve » hieu va, hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
ha hoi » hoa hoi, ha noi, xa hoi
ve cau » ke cau, va cau, ve cac
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: ((tu cach) or (te sach)) ky lang ha hoi. hieu ve cau thuc vat dinh vi ((cua tre) OR (cua te))~.
• 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 vat dinh vi ((cua tre) OR (cua te)).
• 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 vat dinh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky lang ha hoi. hieu ve cau thuc vat dinh vi ((cua tre) OR (cua te))*.