Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
xa thanh » va thanh, ha thanh, ta thanh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cua tre » cuu tre, cua triet, dua tren
hieu va » lieu va, hieu qua
nam tu » nam thu, nam thuc
va nam » van nam, ha nam, va nay
cua te » cua tu
o hoi » co hoi, o hoc, o hai
tu xa » tu xay, tu va, te xa
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: su sach ty xang ((x hoi) OR (o hoi)). hieu va nam tu xa thanh ve ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang ((x hoi) OR (o hoi)). hieu va nam tu xa thanh ve ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty xang ((x hoi) OR (o hoi)). hieu va nam tu xa thanh ve ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ty xang ((x hoi) OR (o hoi)). hieu va nam tu xa thanh ve ((cua tre) or (cua te))*.