Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. ((hieu ve) OR (lieu va)) cac truc va hanh vi ((cuu tre) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang x hoi. ((hieu ve) OR (lieu va)) cac truc va hanh vi ((cuu tre) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: so sach y nang x hoi. ((hieu ve) OR (lieu va)) cac truc va hanh vi ((cuu tre) OR (cua tu))*.