Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
sach thu » sach thue, sach thieu, sach tham
sach tru » sach truc, sach tu, sach tren
dung de » dung he, dung dat
danh de » hanh de, dan de, dang de
hien tu » khien tu, dien tu
tu cham » toc cham, thi cham
x hoi » xa hoi, o hoi, x ho
kien » bien, vien, tien

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 thu)) nang x hoi. hien tu cham duc va ((danh de) or (dung de)) su kien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tru) OR (sach thu)) nang x hoi. hien tu cham duc va ((danh de) OR (dung de)) su kien.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tru) or (sach thu)) nang x hoi. hien tu cham duc va ((danh de) or (dung de)) su kien*.