Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
trung quan » truong quan, trong quan, trung tuan
quan trong » gian trong
doc hieu » hoc thieu, hoc hien
cong ban » cong bang, cong san, cong tan
than cao » thai cao, than cap, than sao
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (toc thieu)) sach - manh trung quan trong cong ban ((than cao) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) sach - manh trung quan trong cong ban ((than cao) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (toc thieu)) sach - manh trung quan trong cong ban ((than cao) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) sach - manh trung quan trong cong ban ((than cao) OR (toan cao))*.