Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
tu nano » truc nano
dinh tu » danh tu, dinh cu, tinh tu
nano x » nano 1, nano o
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, duc va
x hoi » xa hoi, o hoi, x ho
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 (thu sach)) tu nano x hoi. lieu va cam ((tuc va) or (tuc xa)) dinh tu va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) tu nano x hoi. lieu va cam ((tuc va) OR (tuc xa)) dinh tu va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) tu nano x hoi. lieu va cam ((tuc va) or (tuc xa)) dinh tu va thiet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) tu nano x hoi. lieu va cam ((tuc va) or (tuc xa)) dinh tu va thiet*.