Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hiem he » hiem xe, hieu he, thien he
so viet » hoc viet
he nam » ha nam, nghe nam
nam tu » nam thu, nam thuc
ca dan » cac dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hiem he nam tu ((ca dan) or (ca dao)) va ((su triet) or (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hiem he nam tu ((ca dan) OR (ca dao)) va ((su triet) OR (so viet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hiem he nam tu ((ca dan) or (ca dao)) va ((su triet) or (so viet))*.