Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban danh » ban doanh, ban hanh, ban dan
tu sach » thu sach, su sach, te sach
cua tre » cuu tre, cua triet, dua tren
danh vi » hanh vi, dinh vi, danh di
xuc ban » duc ban, cuc ban, quoc ban
lam xuc » cam xuc, lam duoc
van lam » van nam
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
cua te » cua tu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 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 ty nang ((x hoi) OR (o hoi)). hieu van lam xuc ban danh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((x hoi) OR (o hoi)). hieu van lam xuc ban danh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((x hoi) OR (o hoi)). hieu van lam xuc ban danh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x hoi) OR (o hoi)). hieu van lam xuc ban danh vi ((cua tre) or (cua te))*.