Perhaps you should try some spelling variations:
su triet » su tien, ve triet
tu sach » thu sach, su sach, te 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
su viet » so viet
he nam » ha nam, nghe nam
nam tu » nam thu, nam thuc
ca dan » cac dan, ca dao
dan va » doan va, dan ca, ban va
tu ca » tu cac, tu cua, tu can

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

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