Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu he » hieu ve, hiem he, hieu le
he nam » ha nam, nghe nam
xe dan » le dan, he dan, de dan
ke dan » le dan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu he nam thu ((xe dan) OR (ke dan)) hai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu he nam thu ((xe dan) OR (ke dan)) hai ((cua triet) or (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu he nam thu ((xe dan) OR (ke dan)) hai ((cua triet) or (cua viet))*.