Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hanh tang » hanh trang, anh tang, hanh mang
chu tinh » chau tinh, chua tinh, cuu tinh
tang cua » mang cua, hang cua, tang luan
toan cao » toan tap
toan ban » van ban
hoi chu » hoi chuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi chu tinh - hanh tang cua ((nhung cong) or (thong cong)) dan ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi chu tinh - hanh tang cua ((nhung cong) OR (thong cong)) dan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi chu tinh - hanh tang cua ((nhung cong) or (thong cong)) dan ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoi chu tinh - hanh tang cua ((nhung cong) or (thong cong)) dan ((toan cao) OR (toan ban))*.