Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
da voi » dao voi, dua voi, ba voi
dat vo » dat va, dat o, dat ve
cua tu » cua tuc, cua su, cua cu

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 ((da voi) or (dat vo)) van hanh vai ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu vien ((da voi) OR (dat vo)) van hanh vai ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu vien ((da voi) or (dat vo)) van hanh vai ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu vien ((da voi) or (dat vo)) van hanh vai ((cua te) OR (cua tu))*.