Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
cac tac » cac toc, cac bac, cac tai
cac dac » cac dan, cac dai, cac bac
nang xa » lang xa, nang ma, mang xa
su sach » so sach, vu sach
vi su » va su, ve su, ki su

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