Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
manh toan » thanh toan, anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc hieu
san toan » van toan, dan toan, xuan toan

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