Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
bac tuc » bach tuoc, bac thua
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, dai cua
bac tu » ban tu, tac tu, cac tu

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