Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
van cham » van chat, van tham, va cham
ban hanh » ban hang
cham xuc » cam xuc, chat xuc, cham soc
hieu van » hieu va, thien van, lieu va
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
lai cua » dai cua, hai cua, thai cua
nang o » nang co, nang ho, nang ro
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: toc sach tu nang o hoi. hieu van cham xuc ((van thanh) or (ban hanh)) ((lai cua) OR (lai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang o hoi. hieu van cham xuc ((van thanh) OR (ban hanh)) ((lai cua) OR (lai chau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu nang o hoi. hieu van cham xuc ((van thanh) or (ban hanh)) ((lai cua) OR (lai chau)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang o hoi. hieu van cham xuc ((van thanh) or (ban hanh)) ((lai cua) OR (lai chau)) tre*.