Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
cam thuc » am thuc, nam thuc, cam thu
lang van » dang van, tang van, hoang van
hieu va » lieu va, hieu qua
tu cach » tu cac
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
va dan » ca dan, va dao, va dap
va dau » va dao
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao

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 (thu sach)) ky lang van hoi. hieu va cam thuc ((va dan) OR (va dau)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky lang van hoi. hieu va cam thuc ((va dan) OR (va dau)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky lang van hoi. hieu va cam thuc ((va dan) OR (va dau)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky lang van hoi. hieu va cam thuc ((va dan) OR (va dau)) vi cua triet*.