Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
chua te » cua te, chua tu, chuan ted
danh ca » dan ca, doanh cua, danh cho
va danh » va dinh, va dan, va hanh
chua xe » chua xi, chuan he, chuan ve
tu nano » truc nano
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
nano x » nano 1, nano o
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: tu sach tu nano x hoi. hieu ((ve cam) or (ve cac)) duc va danh ca ((chua te) OR (chua xe))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nano x hoi. hieu ((ve cam) OR (ve cac)) duc va danh ca ((chua te) OR (chua xe)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nano x hoi. hieu ((ve cam) or (ve cac)) duc va danh ca ((chua te) OR (chua xe))".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nano x hoi. hieu ((ve cam) or (ve cac)) duc va danh ca ((chua te) OR (chua xe))*.