Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
sach tru » sach thu, sach tu, sach tren
cham duc » pham duc, cham soc, pham duy
dung de » dung he, dung dat
danh de » hanh de, dan de, dang de
tu cham » toc cham, thi cham
hien tu » khien tu, dien tu
su tien » su kien, su hien, tu tieng
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 tru) OR (sach truc)) nang x 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) OR (sach truc)) nang x 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) OR (sach truc)) nang x hoi. hien tu cham duc va ((danh de) or (dung de)) su tien".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tru) OR (sach truc)) nang x hoi. hien tu cham duc va ((danh de) or (dung de)) su tien*.