Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
thanh lam » hanh lam, thanh nam, thanh tam
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cao » van dao, van bao, van hao
cao duc » dao duc, cao suc, giao duc
bo sach » co sach, hoc sach
cua te » cua tu
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: ((tu sach) or (bo sach)) ky nang x hoi. hieu van cao duc va ((thanh lam) OR (thanh lap)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (bo sach)) ky nang x hoi. hieu van cao duc va ((thanh lam) OR (thanh lap)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (bo sach)) ky nang x hoi. hieu van cao duc va ((thanh lam) OR (thanh lap)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (bo sach)) ky nang x hoi. hieu van cao duc va ((thanh lam) OR (thanh lap)) cua te*.