Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
thanh di » thanh doi, thanh de, thanh do
hieu van » hieu va, lieu va, hieu ve
sach ly » sach y, sach lo, sach ty
lam cuu » lam chu, lam cua, cham cuu
ly nang » ky nang, ly hang, ly vang
di cua » dai cua, doi cua, de cua
cua te » cua tu
o hoi » co hoi, o hoc, o hai
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: thu sach ly nang ((x hoi) or (o hoi)). ((hieu van) or (thien van)) lam cuu van thanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly nang ((x hoi) OR (o hoi)). ((hieu van) OR (thien van)) lam cuu van thanh di cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach ly nang ((x hoi) or (o hoi)). ((hieu van) or (thien van)) lam cuu van thanh di cua te*.