Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
lap cua » lai cua, tap cua, lam cua
so sach » so sanh, bo sach, co sach
cao duc » dao duc, cao suc, giao duc
van cao » van dao, van bao, van hao
cua te » cua tu
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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) or (so sach)) ky nang ((x hoi) OR (o hoi)). hieu van cao duc va thanh lap cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky nang ((x hoi) OR (o hoi)). hieu van cao duc va thanh lap cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sach)) ky nang ((x hoi) OR (o hoi)). hieu van cao duc va thanh lap cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky nang ((x hoi) OR (o hoi)). hieu van cao duc va thanh lap cua te*.