Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
te sach » toc sach
dinh tu » danh tu, dinh cu, tinh tu
nano 1 » nano o
xuc va » tuc va, luc va, xac va
1 hoi » o hoi, 5 hoi
thiet » thieu

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 truc nano 1 hoi. hieu van nam ((xuc va) OR (duc va)) dinh tu ((ve triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach truc nano 1 hoi. hieu van nam ((xuc va) OR (duc va)) dinh tu ((ve triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach truc nano 1 hoi. hieu van nam ((xuc va) OR (duc va)) dinh tu ((ve triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: te sach truc nano 1 hoi. hieu van nam ((xuc va) OR (duc va)) dinh tu ((ve triet) or (va thiet))*.