Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
dao duc » giao duc, tao duoc
danh va » doanh va, hanh va, anh va
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 tru nang x hoi. hieu van dao duc va ((danh va) or (hang va)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tru nang x hoi. hieu van dao duc va ((danh va) OR (hang va)) cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach tru nang x hoi. hieu van dao duc va ((danh va) or (hang va)) cua te*.