Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
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 hoc » cach hoc, cac hop, cac toc
bac hoc » bai hoc, bac ho
hanh va » hang va, hanh vi
va ve » va de, va le, va vi

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 hoc) or (bac hoc)) van hanh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu vien ((cac hoc) OR (bac hoc)) van hanh va ve triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu vien ((cac hoc) or (bac hoc)) van hanh va ve triet*.