Perhaps you should try some spelling variations:
sach truc » sach tren, sach thu, sach thue
cach thuc » anh thuc, cac thu
va triet » va trien, ve triet, cua triet
dinh ve » dinh ket, dinh van
va dinh » van dinh, va kinh, va tinh
lam xuc » cam xuc, lam duoc
thi van » thi lan, thi hanh, thi nang
van lam » van nam
xuc va » duc va, tuc va, luc va
nano o » nano 1, nano cuo, nano mot
o hoi » co hoi, o hoc, o hai
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: tu ((sach truc) OR (cach thuc)) nano o hoi. thi van lam xuc va dinh ve ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach truc) OR (cach thuc)) nano o hoi. thi van lam xuc va dinh ve ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach truc) OR (cach thuc)) nano o hoi. thi van lam xuc va dinh ve ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach truc) OR (cach thuc)) nano o hoi. thi van lam xuc va dinh ve ((va triet) or (va thiet))*.