Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
tan than » tan thanh, tan tran, ban than
than cao » toan cao, thai cao, than cap

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

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