Perhaps you should try some spelling variations:
van dinh » van minh, van dich, va dinh
dan dinh » dang dinh, doan dinh, dao dinh
cau thuc » cau truc, cuu thuc, can thuc
tu cach » tu cac
ket cua » ket qua, det cua, keo cua
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
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 tang xa hoi. hieu ve cau thuc ((dan dinh) OR (van dinh)) ket cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (te sach)) ky tang xa hoi. hieu ve cau thuc ((dan dinh) OR (van dinh)) ket cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (te sach)) ky tang xa hoi. hieu ve cau thuc ((dan dinh) OR (van dinh)) ket cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky tang xa hoi. hieu ve cau thuc ((dan dinh) OR (van dinh)) ket cua tre*.