Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
toc sach » hoc sach, doc sach, thuoc sach
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va dung » van dung, va duong, vat dung
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang xa hoi. hieu va pham duc va dung va ((((cua triet) or (va triet))) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu va pham duc va dung va ((((cua triet) OR (va triet))) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu va pham duc va dung va ((((cua triet) or (va triet))) or (cua tu))*.