Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cac thoi » cac toi, cac hop, cac tro
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac toc » cac toi, cac nuoc
vi ve » va ve, gi ve, ve ve

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 vien ((cac toc) OR (cac thoi)) van hanh vi ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu vien ((cac toc) OR (cac thoi)) van hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu vien ((cac toc) OR (cac thoi)) van hanh vi ve triet*.