Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
va dinh » van dinh, va kinh, va tinh
dinh tu » danh tu, dinh cu, tinh tu
nano x » nano o
nano 1 » nano o
xuc va » duc va, tuc va, luc va

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