Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
te sach » toc sach
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va dan » ca dan, va dau, va dap
va dao » ca dao

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 ky lang xa hoi. hieu va cac tuc ((va dan) OR (va dao)) khai ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu va cac tuc ((va dan) OR (va dao)) khai ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu va cac tuc ((va dan) OR (va dao)) khai ((cua triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu va cac tuc ((va dan) OR (va dao)) khai ((cua triet) or (su triet))*.