Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
dung de » dung he, dung dat
danh de » hanh de, dan de, dang de
tu cham » toc cham, thi cham
su tien » su kien, su hien, tu tieng
hien tu » khien tu, dien tu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 tru nang ((x hoi) OR (o hoi)). hien tu cham duc va ((danh de) or (dung de)) su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tru nang ((x hoi) OR (o hoi)). hien tu cham duc va ((danh de) OR (dung de)) su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tru nang ((x hoi) OR (o hoi)). hien tu cham duc va ((danh de) or (dung de)) su tien".
• Adding a wildcard symbol may retrieve word variants: tu sach tru nang ((x hoi) OR (o hoi)). hien tu cham duc va ((danh de) or (dung de)) su tien*.