Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
thi van » thi lan, thi hanh, thi nang
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
lam xuc » cam xuc, lam duoc
van lam » van nam
te sach » toc sach
nano x » nano 1, nano o
x hoi » xa hoi, o hoi, x ho
vu va » vu van, tu va, su va
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) OR (te sach)) truc nano x hoi. thi van lam xuc ((va dinh) or (va tinh)) vu va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) truc nano x hoi. thi van lam xuc ((va dinh) OR (va tinh)) vu va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) truc nano x hoi. thi van lam xuc ((va dinh) or (va tinh)) vu va thiet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) truc nano x hoi. thi van lam xuc ((va dinh) or (va tinh)) vu va thiet*.