Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, hien hanh
trung cua » truong cua, trung tuan, trung cap
cong hang » cong thang, cong hung, cong lang
toan ban » van ban
va toan » van toan, bai toan, tap toan

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

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