Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
chieu sach » chinh sach, chiet tach, chieu sang
trung tham » trung tam, trung thanh, trung thang
tham nhung » thi nhung
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
cong san » cong tac
toan tap » toan ban
tan tap » han tap, tan tat, man tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (hieu lang)) - hanh trung tham nhung cong san ((tan tap) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (hieu lang)) - hanh trung tham nhung cong san ((tan tap) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (hieu lang)) - hanh trung tham nhung cong san ((tan tap) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (hieu lang)) - hanh trung tham nhung cong san ((tan tap) OR (toan tap))*.