Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
duc manh » suc manh, duc anh, duc minh
te sach » toc sach
van cao » van dao, van bao, van hao
duc van » duc va, duc tan, duc phan
bai cua » ban cua, dai cua, bai ca
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, v nang
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: te sach y nang x hoi. hieu van cao ((duc van) OR (duc manh)) thanh ((bai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. hieu van cao ((duc van) OR (duc manh)) thanh ((bai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. hieu van cao ((duc van) OR (duc manh)) thanh ((bai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu van cao ((duc van) OR (duc manh)) thanh ((bai cua) or (hai cua)) tre*.