Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nuoc sach » nguoi sach, hoc sach, cuoc cach
tham thuc » nham thuc, pham thuc, tam thuc
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
te sach » toc sach
hieu va » lieu va, hieu qua
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
va tham » van tham, va cham, va thanh
ha hoi » hoa hoi, ha noi, xa hoi
di cua » dai cua, doi cua, de cua

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

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