Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
hanh trung » thanh trung, hanh trang, manh trung
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
trung dap » trung cap, trung dai, trung dam
hoc hieu » hoc thieu, hoc hien, doc hieu
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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 lang - hanh trung dap ((nhung cong) or (thong cong)) ((dan than) OR (van than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh trung dap ((nhung cong) OR (thong cong)) ((dan than) OR (van than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh trung dap ((nhung cong) or (thong cong)) ((dan than) OR (van than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trung dap ((nhung cong) or (thong cong)) ((dan than) OR (van than)) cau*.