Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
cua tu » cua tuc, cua cu, cua te
cua su » qua su
lo van » le van, vo van, so van
lo va » lao va, ly va, le va

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