Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
trung ha » trung hoc, trung tam, trung cap
trang va » tran van, hang va
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh ((trung ha) or (trang va)) ((nhung cong) or (dung cong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((trung ha) OR (trang va)) ((nhung cong) OR (dung cong)) manh toan cao.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((trung ha) or (trang va)) ((nhung cong) or (dung cong)) manh toan cao*.