Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » toc thieu, hoc thieu, hoc hien
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - hanh trung cua ((hang cong) or (dang cong)) manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - hanh trung cua ((hang cong) OR (dang cong)) manh toan ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh trung cua ((hang cong) or (dang cong)) manh toan ban*.