Perhaps you should try some spelling variations:
tru nang » tra nang, tri nang, truc nano
danh gia » dan gian
tu sach » thu sach, su sach, te sach
gia cua » gian cua, giau cua, gia cuc
tu nano » truc nano
va danh » va dinh, va dan, va hanh
ve cao » va cao, ve bao, ve co
ve cac » va cac, vien cac
cua te » cua tu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tru nang) OR (tu nano)) xa hoi. hieu ((ve cao) OR (ve cac)) duc va danh gia cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tru nang) or (tu nano)) xa hoi. hieu ((ve cao) OR (ve cac)) duc va danh gia cua te~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tru nang) or (tu nano)) xa hoi. hieu ((ve cao) OR (ve cac)) duc va danh gia cua te*.