Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
dang xa » dang xay, lang xa, dang ha
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
van am » van nam, van lam, van dam
vi duc » oi duc, ve duc, vi du

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty dang xa hoi. hieu van am thuc va hanh ((vi duc) OR (vu duc)) tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty dang xa hoi. hieu van am thuc va hanh ((vi duc) OR (vu duc)) tren".
• Adding a wildcard symbol may retrieve word variants: so sach ty dang xa hoi. hieu van am thuc va hanh ((vi duc) OR (vu duc)) tren*.