Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
va triet » va thiet, va trien, ve triet
dich tu » dich vu, dich te, dinh tu
xuc van » duc van, luc van, vuc van
vu cham » va cham, vu kham, tu cham
ve cham » va cham, ve chat, ve chim
tu sach » thu sach, su sach, te sach
nano 1 » nano o
nano x » nano o

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. hieu ((ve cham) OR (vu cham)) xuc van dich 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. hieu ((ve cham) OR (vu cham)) xuc van dich 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. hieu ((ve cham) OR (vu cham)) xuc van dich tu va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach truc ((nano x) or (nano 1)) hoi. hieu ((ve cham) OR (vu cham)) xuc van dich tu va triet*.