Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va chat » van chat, va phat, cao chat
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
goc va » hoc va, doc va, uoc va
loc va » hoc va, luc va
va cuu » va cau, va chu, va huu
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((x hoi) OR (x ho)). lieu va chat ((goc va) or (loc va)) hanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (x ho)). lieu va chat ((goc va) OR (loc va)) hanh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) OR (x ho)). lieu va chat ((goc va) or (loc va)) hanh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) OR (x ho)). lieu va chat ((goc va) or (loc va)) hanh va cuu tre*.