Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
dan chan » dan gian, dan ca, van chat
chan tu » phan tu, han tu, chon tu

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 cua ((nhung cong) or (dung cong)) dan chan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh trung cua ((nhung cong) OR (dung cong)) dan chan tu.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trung cua ((nhung cong) or (dung cong)) dan chan tu*.