Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
chao tu » chao xu, cho tu, cao tu
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va va » va van, va vua, va vai
thiet » thieu

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 ty nang xa hoi. ((hieu ve) OR (hieu van)) chao tu va hanh va va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu ve) OR (hieu van)) chao tu va hanh va va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu ve) OR (hieu van)) chao tu va hanh va va thiet*.