Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
pham duy » pham duc
hieu van » hieu va, thien van, lieu va
cham duc » pham duc, cham soc, phan duc
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. hieu van ((cham duc) OR (pham duy)) van hanh vi ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu van ((cham duc) OR (pham duy)) van hanh vi ((va triet) OR (su triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu van ((cham duc) OR (pham duy)) van hanh vi ((va triet) or (su triet))*".