Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau thuc » cau truc, cuu thuc, can thuc
ket cua » ket qua, det cua, keo cua
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
tu cach » tu cac
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
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 ((va dinh) OR (va tinh)) ket cua triet~.
• 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 ((va dinh) OR (va tinh)) ket cua triet.
• 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 ((va dinh) OR (va tinh)) ket cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky tang xa hoi. hieu ve cau thuc ((va dinh) OR (va tinh)) ket cua triet*.