Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va cau » van cau, va cac, va dau
dai su » dai sua, dai so, lai su
dan su » dang su

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. lieu va cau truc va hanh ((dai su) OR (dan su)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. lieu va cau truc va hanh ((dai su) OR (dan su)) triet*.