Perhaps you should try some spelling variations:
tru nang » tra nang, tri nang, thi nang
hieu van » hieu va, thien van, lieu va
van dinh » van minh, van dich, va dinh
tu sach » thu sach, su sach, te sach
dao duc » giao duc, tao duoc
duc van » duc va, duc tan, duc manh
dinh va » dinh van, dinh ve, tinh va
chua te » chua tu, chua xe, chuan ted
cua te » cua tu

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) or (truc nano)) xa hoi. hieu van dao duc van dinh va ((chua te) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tru nang) OR (truc nano)) xa hoi. hieu van dao duc van dinh va ((chua te) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tru nang) or (truc nano)) xa hoi. hieu van dao duc van dinh va ((chua te) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tru nang) or (truc nano)) xa hoi. hieu van dao duc van dinh va ((chua te) OR (cua te))*.