Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va trien » va truyen, va thiet, va tieng
vien dai » hien dai
va tuyen » va truyen, tac tuyen, ke tuyen
vien da » hien dai
sach tu » sach thu, cach tu, sach ty
va tinh » may tinh
tinh te » kinh te, tinh tu, tinh he
tu nano » truc nano
nano x » nano 1, nano o
tuc va » thuc va, truc va, tuc xa
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: thuoc sach tu nano x hoi. hieu ((vien da) or (vien dai)) tuc va tinh te ((va trien) OR (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach tu nano x hoi. hieu ((vien da) OR (vien dai)) tuc va tinh te ((va trien) OR (va tuyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach tu nano x hoi. hieu ((vien da) or (vien dai)) tuc va tinh te ((va trien) OR (va tuyen))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach tu nano x hoi. hieu ((vien da) or (vien dai)) tuc va tinh te ((va trien) OR (va tuyen))*.